diff --git a/setup.cfg b/setup.cfg
index 02bad3c915..1d9525fc51 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -63,3 +63,4 @@ exclude_also =
     \.\.\.
     pass$
     if settings.DEBUG:
+    assert_never\(.*\)
diff --git a/src/openforms/formio/typing/__init__.py b/src/openforms/formio/typing/__init__.py
index 8283e31bee..e029da21ba 100644
--- a/src/openforms/formio/typing/__init__.py
+++ b/src/openforms/formio/typing/__init__.py
@@ -16,6 +16,7 @@
     EditGridComponent,
     FieldsetComponent,
     FileComponent,
+    FileValue,
     RadioComponent,
     SelectBoxesComponent,
     SelectComponent,
@@ -31,6 +32,7 @@
     "TextFieldComponent",
     "DateComponent",
     "DatetimeComponent",
+    "FileValue",
     "FileComponent",
     "SelectComponent",
     "SelectBoxesComponent",
diff --git a/src/openforms/formio/typing/vanilla.py b/src/openforms/formio/typing/vanilla.py
index 31633393a4..0deff5c676 100644
--- a/src/openforms/formio/typing/vanilla.py
+++ b/src/openforms/formio/typing/vanilla.py
@@ -22,6 +22,29 @@ class FileComponent(Component):
     maxNumberOfFiles: NotRequired[int]
 
 
+class FileData(TypedDict):
+    url: str
+    form: Literal[""]
+    name: str
+    size: int
+    baseUrl: str
+    project: Literal[""]
+
+
+class SingleFileValue(TypedDict):
+    # Source of truth: https://github.com/open-formulieren/types/blob/main/src/formio/components/file.ts
+    name: str
+    originalName: str
+    size: int
+    storage: Literal["url"]
+    type: str
+    url: str
+    data: FileData
+
+
+type FileValue = list[SingleFileValue]
+
+
 class SelectData(TypedDict, total=False):
     values: list[OptionDict]
 
diff --git a/src/openforms/registrations/contrib/objects_api/handlers/v2.py b/src/openforms/registrations/contrib/objects_api/handlers/v2.py
index c1399cbef2..f1e9efab8d 100644
--- a/src/openforms/registrations/contrib/objects_api/handlers/v2.py
+++ b/src/openforms/registrations/contrib/objects_api/handlers/v2.py
@@ -5,11 +5,14 @@
 from collections.abc import Sequence
 from dataclasses import dataclass
 from datetime import date, datetime
+from typing import assert_never, cast
 
 from glom import Assign, Path, glom
 
 from openforms.api.utils import underscore_to_camel
-from openforms.formio.typing import Component
+from openforms.formio.service import FormioData
+from openforms.formio.typing import Component, EditGridComponent
+from openforms.formio.typing.vanilla import FileComponent
 from openforms.typing import JSONObject, JSONValue
 
 from ..typing import ObjecttypeVariableMapping
@@ -56,7 +59,31 @@ def process_mapped_variable(
         JSONValue | date | datetime
     ),  # can't narrow it down yet, as the type depends on the component type
     component: Component | None = None,
+    attachment_urls: dict[str, list[str]] | None = None,
 ) -> AssignmentSpec | Sequence[AssignmentSpec]:
+    """
+    Apply post-processing to a mapped variable.
+
+    A mapped variable may have additional options that specify the behaviour of how the
+    values are translated before they end up in the Objects API record. Often, these
+    transformations are dependent on the component type being processed.
+
+    :arg mapping: The mapping of form variable to destination path, including possible
+      component-specific configuration options that influence the mapping behaviour.
+    :arg value: The raw value of the form variable for the submission being processed.
+      The type/shape of the value depends on the variable/component data type being
+      processed and even the component configuration (such as multiple True/False).
+    :arg component: If the variable corresponds to a Formio component, the component
+      definition is provided, otherwise ``None``.
+    :arg attachment_urls: The registration plugin uploads attachments to a Documents API
+      and provides the API resource URL for each attachment. Keys are the data paths in
+      the (Formio) submission data, e.g. `myAttachment` or ``repeatingGroups.2.file``.
+
+    :returns: A single assignment spec or collection of assignment specs that specify
+      which value needs to be written to which "object path" for the record data, for
+      possible deep assignments.
+    """
+    variable_key = mapping["variable_key"]
     target_path = Path(*bits) if (bits := mapping.get("target_path")) else None
 
     # normalize non-primitive date/datetime values so that they're ready for JSON
@@ -95,21 +122,99 @@ def process_mapped_variable(
                 assert target_path is not None
                 return AssignmentSpec(destination=target_path, value=value)
 
-        # multiple files - return an array
-        case {"type": "file", "multiple": True}:
-            assert isinstance(value, list)
-
-        # single file - return only one element
         case {"type": "file"}:
-            assert isinstance(value, list)
-            value = value[0] if value else ""
+            assert attachment_urls is not None
+            value = _transform_file_value(
+                cast(FileComponent, component), attachment_urls
+            )
 
         case {"type": "map"}:
             assert isinstance(value, dict)
 
+        case {"type": "editgrid"} if attachment_urls is not None:
+            assert isinstance(value, list)
+            value = _transform_editgrid_value(
+                cast(EditGridComponent, component),
+                cast(list[JSONObject], value),
+                attachment_urls=attachment_urls,
+                key_prefix=variable_key,
+            )
         # not a component or standard behaviour where no transformation is necessary
         case None | _:
             pass
 
     assert target_path is not None
     return AssignmentSpec(destination=target_path, value=value)
+
+
+def _transform_file_value(
+    component: FileComponent,
+    attachment_urls: dict[str, list[str]],
+    key_prefix: str = "",
+) -> str | list[str]:
+    """
+    Transform a single file component value according to the component configuration.
+    """
+    key = component["key"]
+    multiple = component.get("multiple", False)
+
+    # it's possible keys are missing because there are no uploads at all for the
+    # component.
+    data_path = f"{key_prefix}.{key}" if key_prefix else key
+    upload_urls = attachment_urls.get(data_path, [])
+
+    match upload_urls:
+        # if there are no uploads and it's a single component -> normalize to empty string
+        case [] if not multiple:
+            return ""
+
+        # if there's an upload and it's a single component -> return the single URL string
+        case list() if upload_urls and not multiple:
+            return upload_urls[0]
+
+        # otherwise just return the list of upload URLs
+        case list():
+            assert multiple
+            return upload_urls
+
+        case _:
+            assert_never(upload_urls)
+
+
+def _transform_editgrid_value(
+    component: EditGridComponent,
+    value: list[JSONObject],
+    attachment_urls: dict[str, list[str]],
+    key_prefix: str,
+) -> list[JSONObject]:
+    nested_components = component["components"]
+
+    items: list[JSONObject] = []
+
+    # process file uploads inside (nested) repeating groups
+    for index, item in enumerate(value):
+        item_values = FormioData(item)
+
+        for nested_component in nested_components:
+            key = nested_component["key"]
+
+            match nested_component:
+                case {"type": "file"}:
+                    item_values[key] = _transform_file_value(
+                        cast(FileComponent, nested_component),
+                        attachment_urls=attachment_urls,
+                        key_prefix=f"{key_prefix}.{index}",
+                    )
+                case {"type": "editgrid"}:
+                    nested_items = item_values[key]
+                    assert isinstance(nested_items, list)
+                    item_values[key] = _transform_editgrid_value(
+                        cast(EditGridComponent, nested_component),
+                        value=cast(list[JSONObject], nested_items),
+                        attachment_urls=attachment_urls,
+                        key_prefix=f"{key_prefix}.{index}.{key}",
+                    )
+
+        items.append(item_values.data)
+
+    return items
diff --git a/src/openforms/registrations/contrib/objects_api/submission_registration.py b/src/openforms/registrations/contrib/objects_api/submission_registration.py
index 06e3396758..3f73dbeb8a 100644
--- a/src/openforms/registrations/contrib/objects_api/submission_registration.py
+++ b/src/openforms/registrations/contrib/objects_api/submission_registration.py
@@ -15,7 +15,9 @@
     override,
 )
 
-from django.db.models import F
+from django.db import models
+from django.db.models import F, Value
+from django.db.models.functions import Coalesce, NullIf
 
 from openforms.authentication.service import AuthAttribute
 from openforms.contrib.objects_api.clients import (
@@ -478,11 +480,19 @@ def get_attachment_urls_by_key(submission: Submission) -> dict[str, list[str]]:
         attachments = ObjectsAPISubmissionAttachment.objects.filter(
             submission_file_attachment__submission_variable__submission=submission
         ).annotate(
-            variable_key=F("submission_file_attachment__submission_variable__key")
+            data_path=Coalesce(
+                NullIf(
+                    F("submission_file_attachment___component_data_path"),
+                    Value(""),
+                ),
+                # fall back to variable/component key if no explicit data path is set
+                F("submission_file_attachment__submission_variable__key"),
+                output_field=models.TextField(),
+            ),
         )
         for attachment_meta in attachments:
             key: str = (
-                attachment_meta.variable_key  # pyright: ignore[reportAttributeAccessIssue]
+                attachment_meta.data_path  # pyright: ignore[reportAttributeAccessIssue]
             )
             urls_map[key].append(attachment_meta.document_url)
         return urls_map
@@ -528,28 +538,21 @@ def get_record_data(
                 variable = None
 
             value: JSONValue | date | datetime
-            # special casing documents - we transform the formio file upload data into
-            # the api resource URLs for the uploaded documents in the Documens API.
-            # Normalizing to string/array of strings is done later via
-            # process_mapped_variable which receives the component configuration.
-            if key in urls_map:
-                value = urls_map[key]  # pyright: ignore[reportAssignmentType]
-            else:
-                try:
-                    value = all_values[key]
-                except KeyError:
-                    logger.info(
-                        "Expected key %s to be present in the submission (%s) variables, "
-                        "but it wasn't. Ignoring it.",
-                        key,
-                        submission.uuid,
-                        extra={
-                            "submission": submission.uuid,
-                            "key": key,
-                            "mapping_config": mapping,
-                        },
-                    )
-                    continue
+            try:
+                value = all_values[key]
+            except KeyError:
+                logger.info(
+                    "Expected key %s to be present in the submission (%s) variables, "
+                    "but it wasn't. Ignoring it.",
+                    key,
+                    submission.uuid,
+                    extra={
+                        "submission": submission.uuid,
+                        "key": key,
+                        "mapping_config": mapping,
+                    },
+                )
+                continue
 
             # Look up if the key points to a form component that provides additional
             # context for how to process the value.
@@ -562,7 +565,10 @@ def get_record_data(
 
             # process the value so that we can assign it to the record data as requested
             assignment_spec = process_mapped_variable(
-                mapping=mapping, value=value, component=component
+                mapping=mapping,
+                value=value,
+                component=component,
+                attachment_urls=urls_map,
             )
             if isinstance(assignment_spec, AssignmentSpec):
                 assignment_specs.append(assignment_spec)
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_addressNl_legacy_before_of_30.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_addressNl_legacy_before_of_30.yaml
index 50eb90131c..a040e83dfb 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_addressNl_legacy_before_of_30.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_addressNl_legacy_before_of_30.yaml
@@ -20,7 +20,7 @@ interactions:
         everything","namePlural":"Accepts everything","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-07-22","modifiedAt":"2024-07-22","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/644ab597-e88c-43c0-8321-f12113510b0e","uuid":"644ab597-e88c-43c0-8321-f12113510b0e","name":"Fieldset
         component","namePlural":"Fieldset component","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/644ab597-e88c-43c0-8321-f12113510b0e/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/f1dde4fe-b7f9-46dc-84ae-429ae49e3705","uuid":"f1dde4fe-b7f9-46dc-84ae-429ae49e3705","name":"Geo
         in data","namePlural":"Geo in data","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/f1dde4fe-b7f9-46dc-84ae-429ae49e3705/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2","uuid":"527b8408-7421-4808-a744-43ccb7bdaaa2","name":"File
-        Uploads","namePlural":"File Uploads","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/3edfdaf7-f469-470b-a391-bb7ea015bd6f","uuid":"3edfdaf7-f469-470b-a391-bb7ea015bd6f","name":"Tree","namePlural":"Trees","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/3edfdaf7-f469-470b-a391-bb7ea015bd6f/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","uuid":"8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","name":"Person","namePlural":"Persons","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2023-10-24","modifiedAt":"2024-11-25","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/1","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/2","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/3","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/4"]}]}'
+        Uploads","namePlural":"File Uploads","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/3edfdaf7-f469-470b-a391-bb7ea015bd6f","uuid":"3edfdaf7-f469-470b-a391-bb7ea015bd6f","name":"Tree","namePlural":"Trees","description":"","dataClassification":"confidential","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-02-08","modifiedAt":"2024-02-08","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/3edfdaf7-f469-470b-a391-bb7ea015bd6f/versions/1"]},{"url":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","uuid":"8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","name":"Person","namePlural":"Persons","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2023-10-24","modifiedAt":"2024-11-25","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/2","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/3","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/1","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/4"]}]}'
     headers:
       Allow:
       - GET, POST, HEAD, OPTIONS
@@ -33,11 +33,11 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:29 GMT
+      - Wed, 29 Jan 2025 17:01:16 GMT
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
@@ -77,11 +77,11 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:29 GMT
+      - Wed, 29 Jan 2025 17:01:16 GMT
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_editgrid_with_nested_files.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_editgrid_with_nested_files.yaml
new file mode 100644
index 0000000000..bab3899c51
--- /dev/null
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_editgrid_with_nested_files.yaml
@@ -0,0 +1,157 @@
+interactions:
+- request:
+    body: '{"informatieobjecttype": "http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7",
+      "bronorganisatie": "000000000", "creatiedatum": "2024-03-19", "titel": "Form
+      002", "auteur": "Aanvrager", "taal": "nld", "formaat": "application/octet-stream",
+      "inhoud": "Y29udGVudA==", "status": "definitief", "bestandsnaam": "foo-0.bin",
+      "ontvangstdatum": "2024-03-17", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
+      false, "bestandsomvang": 7}'
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate, br
+      Authorization:
+      - Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ0ZXN0X2NsaWVudF9pZCIsImlhdCI6MTcxMDg1NTYzNCwiY2xpZW50X2lkIjoidGVzdF9jbGllbnRfaWQiLCJ1c2VyX2lkIjoiIiwidXNlcl9yZXByZXNlbnRhdGlvbiI6IiJ9.NJjZEPSwh9eGzntjwUB7rFAiaq_5DqYgVylWuKdtdMA
+      Connection:
+      - keep-alive
+      Content-Length:
+      - '488'
+      Content-Type:
+      - application/json
+      User-Agent:
+      - python-requests/2.32.2
+    method: POST
+    uri: http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten
+  response:
+    body:
+      string: '{"url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/4b11e35f-5d76-48c8-a7dc-91b1d8086969","identificatie":"DOCUMENT-2024-0000000165","bronorganisatie":"000000000","creatiedatum":"2024-03-19","titel":"Form
+        002","vertrouwelijkheidaanduiding":"openbaar","auteur":"Aanvrager","status":"definitief","formaat":"application/octet-stream","taal":"nld","versie":1,"beginRegistratie":"2025-01-29T17:01:16.380237Z","bestandsnaam":"foo-0.bin","inhoud":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/4b11e35f-5d76-48c8-a7dc-91b1d8086969/download?versie=1","bestandsomvang":7,"link":"","beschrijving":"Bijgevoegd
+        document","ontvangstdatum":"2024-03-17","verzenddatum":null,"indicatieGebruiksrecht":false,"verschijningsvorm":"","ondertekening":{"soort":"","datum":null},"integriteit":{"algoritme":"","waarde":"","datum":null},"informatieobjecttype":"http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7","locked":false,"bestandsdelen":[],"trefwoorden":[],"lock":""}'
+    headers:
+      API-version:
+      - 1.4.2
+      Allow:
+      - GET, POST, HEAD, OPTIONS
+      Content-Length:
+      - '1044'
+      Content-Type:
+      - application/json
+      Cross-Origin-Opener-Policy:
+      - same-origin
+      Location:
+      - http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/4b11e35f-5d76-48c8-a7dc-91b1d8086969
+      Referrer-Policy:
+      - same-origin
+      Vary:
+      - origin
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - DENY
+    status:
+      code: 201
+      message: Created
+- request:
+    body: null
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate, br
+      Authorization:
+      - Token 171be5abaf41e7856b423ad513df1ef8f867ff48
+      Connection:
+      - keep-alive
+      User-Agent:
+      - python-requests/2.32.2
+    method: GET
+    uri: http://localhost:8001/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e
+  response:
+    body:
+      string: '{"url":"http://objecttypes-web:8000/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e","uuid":"8faed0fa-7864-4409-aa6d-533a37616a9e","name":"Accepts
+        everything","namePlural":"Accepts everything","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2024-07-22","modifiedAt":"2024-07-22","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e/versions/1"]}'
+    headers:
+      Allow:
+      - GET, PUT, PATCH, DELETE, HEAD, OPTIONS
+      Connection:
+      - keep-alive
+      Content-Length:
+      - '619'
+      Content-Type:
+      - application/json
+      Cross-Origin-Opener-Policy:
+      - same-origin
+      Date:
+      - Wed, 29 Jan 2025 17:01:16 GMT
+      Referrer-Policy:
+      - same-origin
+      Server:
+      - nginx/1.27.3
+      Vary:
+      - origin
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - DENY
+    status:
+      code: 200
+      message: OK
+- request:
+    body: '{"type": "http://objecttypes-web:8000/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e",
+      "record": {"typeVersion": 1, "data": {"repeatingGroup": [{"nestedRepeatingGroup":
+      [{"file": "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/4b11e35f-5d76-48c8-a7dc-91b1d8086969",
+      "email": "info@example.com"}]}]}, "startAt": "2024-03-19"}}'
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate, br
+      Authorization:
+      - Token 7657474c3d75f56ae0abd0d1bf7994b09964dca9
+      Connection:
+      - keep-alive
+      Content-Crs:
+      - EPSG:4326
+      Content-Length:
+      - '357'
+      Content-Type:
+      - application/json
+      User-Agent:
+      - python-requests/2.32.2
+    method: POST
+    uri: http://localhost:8002/api/v2/objects
+  response:
+    body:
+      string: '{"url":"http://objects-web:8000/api/v2/objects/35ccae85-b9a1-4b1b-8677-8ae9404ba4a2","uuid":"35ccae85-b9a1-4b1b-8677-8ae9404ba4a2","type":"http://objecttypes-web:8000/api/v2/objecttypes/8faed0fa-7864-4409-aa6d-533a37616a9e","record":{"index":1,"typeVersion":1,"data":{"repeatingGroup":[{"nestedRepeatingGroup":[{"file":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/4b11e35f-5d76-48c8-a7dc-91b1d8086969","email":"info@example.com"}]}]},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2025-01-29","correctionFor":null,"correctedBy":null}}'
+    headers:
+      Allow:
+      - GET, POST, HEAD, OPTIONS
+      Connection:
+      - keep-alive
+      Content-Crs:
+      - EPSG:4326
+      Content-Length:
+      - '583'
+      Content-Type:
+      - application/json
+      Cross-Origin-Opener-Policy:
+      - same-origin
+      Date:
+      - Wed, 29 Jan 2025 17:01:16 GMT
+      Location:
+      - http://localhost:8002/api/v2/objects/35ccae85-b9a1-4b1b-8677-8ae9404ba4a2
+      Referrer-Policy:
+      - same-origin
+      Server:
+      - nginx/1.27.3
+      Vary:
+      - origin
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - DENY
+    status:
+      code: 201
+      message: Created
+version: 1
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_empty_optional_file.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_empty_optional_file.yaml
index fd3dfc398f..3697c4cc5d 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_empty_optional_file.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_empty_optional_file.yaml
@@ -30,11 +30,11 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:30 GMT
+      - Wed, 29 Jan 2025 17:01:16 GMT
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
@@ -68,7 +68,7 @@ interactions:
     uri: http://localhost:8002/api/v2/objects
   response:
     body:
-      string: '{"url":"http://objects-web:8000/api/v2/objects/c277e6c8-02da-4257-9051-a13bb67b3d4e","uuid":"c277e6c8-02da-4257-9051-a13bb67b3d4e","type":"http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2","record":{"index":1,"typeVersion":1,"data":{"single_file":""},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2024-12-19","correctionFor":null,"correctedBy":null}}'
+      string: '{"url":"http://objects-web:8000/api/v2/objects/28bb7db5-2806-4291-a731-68ffa0829977","uuid":"28bb7db5-2806-4291-a731-68ffa0829977","type":"http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2","record":{"index":1,"typeVersion":1,"data":{"single_file":""},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2025-01-29","correctionFor":null,"correctedBy":null}}'
     headers:
       Allow:
       - GET, POST, HEAD, OPTIONS
@@ -83,13 +83,13 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:30 GMT
+      - Wed, 29 Jan 2025 17:01:16 GMT
       Location:
-      - http://localhost:8002/api/v2/objects/c277e6c8-02da-4257-9051-a13bb67b3d4e
+      - http://localhost:8002/api/v2/objects/28bb7db5-2806-4291-a731-68ffa0829977
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components.yaml
index 5899c20307..f49c36e19d 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components.yaml
@@ -2,9 +2,9 @@ interactions:
 - request:
     body: '{"informatieobjecttype": "http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7",
       "bronorganisatie": "000000000", "creatiedatum": "2024-03-19", "titel": "Form
-      030", "auteur": "Aanvrager", "taal": "nld", "formaat": "application/rdf+xml",
-      "inhoud": "Y29udGVudA==", "status": "definitief", "bestandsnaam": "attachment1.jpg",
-      "ontvangstdatum": "2024-03-02", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
+      004", "auteur": "Aanvrager", "taal": "nld", "formaat": "image/png", "inhoud":
+      "Y29udGVudA==", "status": "definitief", "bestandsnaam": "attachment1.jpg", "ontvangstdatum":
+      "2024-03-19", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
       false, "bestandsomvang": 7}'
     headers:
       Accept:
@@ -16,7 +16,7 @@ interactions:
       Connection:
       - keep-alive
       Content-Length:
-      - '489'
+      - '479'
       Content-Type:
       - application/json
       User-Agent:
@@ -25,22 +25,22 @@ interactions:
     uri: http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten
   response:
     body:
-      string: '{"url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/33972655-0307-42f7-a62d-3002d974f2e0","identificatie":"DOCUMENT-2024-0000000026","bronorganisatie":"000000000","creatiedatum":"2024-03-19","titel":"Form
-        030","vertrouwelijkheidaanduiding":"openbaar","auteur":"Aanvrager","status":"definitief","formaat":"application/rdf+xml","taal":"nld","versie":1,"beginRegistratie":"2024-12-19T08:19:30.290210Z","bestandsnaam":"attachment1.jpg","inhoud":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/33972655-0307-42f7-a62d-3002d974f2e0/download?versie=1","bestandsomvang":7,"link":"","beschrijving":"Bijgevoegd
-        document","ontvangstdatum":"2024-03-02","verzenddatum":null,"indicatieGebruiksrecht":false,"verschijningsvorm":"","ondertekening":{"soort":"","datum":null},"integriteit":{"algoritme":"","waarde":"","datum":null},"informatieobjecttype":"http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7","locked":false,"bestandsdelen":[],"trefwoorden":[],"lock":""}'
+      string: '{"url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/e512fb79-ae44-4689-8b93-e1ad3e01eb8a","identificatie":"DOCUMENT-2024-0000000166","bronorganisatie":"000000000","creatiedatum":"2024-03-19","titel":"Form
+        004","vertrouwelijkheidaanduiding":"openbaar","auteur":"Aanvrager","status":"definitief","formaat":"image/png","taal":"nld","versie":1,"beginRegistratie":"2025-01-29T17:01:16.909815Z","bestandsnaam":"attachment1.jpg","inhoud":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/e512fb79-ae44-4689-8b93-e1ad3e01eb8a/download?versie=1","bestandsomvang":7,"link":"","beschrijving":"Bijgevoegd
+        document","ontvangstdatum":"2024-03-19","verzenddatum":null,"indicatieGebruiksrecht":false,"verschijningsvorm":"","ondertekening":{"soort":"","datum":null},"integriteit":{"algoritme":"","waarde":"","datum":null},"informatieobjecttype":"http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7","locked":false,"bestandsdelen":[],"trefwoorden":[],"lock":""}'
     headers:
       API-version:
       - 1.4.2
       Allow:
       - GET, POST, HEAD, OPTIONS
       Content-Length:
-      - '1045'
+      - '1035'
       Content-Type:
       - application/json
       Cross-Origin-Opener-Policy:
       - same-origin
       Location:
-      - http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/33972655-0307-42f7-a62d-3002d974f2e0
+      - http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/e512fb79-ae44-4689-8b93-e1ad3e01eb8a
       Referrer-Policy:
       - same-origin
       Vary:
@@ -55,9 +55,9 @@ interactions:
 - request:
     body: '{"informatieobjecttype": "http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7",
       "bronorganisatie": "000000000", "creatiedatum": "2024-03-19", "titel": "Form
-      030", "auteur": "Aanvrager", "taal": "nld", "formaat": "video/quicktime", "inhoud":
-      "Y29udGVudA==", "status": "definitief", "bestandsnaam": "attachment2_1.jpg",
-      "ontvangstdatum": "2024-03-02", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
+      004", "auteur": "Aanvrager", "taal": "nld", "formaat": "multipart/encrypted",
+      "inhoud": "Y29udGVudA==", "status": "definitief", "bestandsnaam": "attachment2_1.jpg",
+      "ontvangstdatum": "2024-03-19", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
       false, "bestandsomvang": 7}'
     headers:
       Accept:
@@ -69,7 +69,7 @@ interactions:
       Connection:
       - keep-alive
       Content-Length:
-      - '487'
+      - '491'
       Content-Type:
       - application/json
       User-Agent:
@@ -78,22 +78,22 @@ interactions:
     uri: http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten
   response:
     body:
-      string: '{"url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ec46dbda-cbeb-4712-ba70-ea7e28d972c6","identificatie":"DOCUMENT-2024-0000000027","bronorganisatie":"000000000","creatiedatum":"2024-03-19","titel":"Form
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-        document","ontvangstdatum":"2024-03-02","verzenddatum":null,"indicatieGebruiksrecht":false,"verschijningsvorm":"","ondertekening":{"soort":"","datum":null},"integriteit":{"algoritme":"","waarde":"","datum":null},"informatieobjecttype":"http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7","locked":false,"bestandsdelen":[],"trefwoorden":[],"lock":""}'
+      string: '{"url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/504849d8-1ae1-4615-9095-a3b452359d10","identificatie":"DOCUMENT-2024-0000000167","bronorganisatie":"000000000","creatiedatum":"2024-03-19","titel":"Form
+        004","vertrouwelijkheidaanduiding":"openbaar","auteur":"Aanvrager","status":"definitief","formaat":"multipart/encrypted","taal":"nld","versie":1,"beginRegistratie":"2025-01-29T17:01:17.004593Z","bestandsnaam":"attachment2_1.jpg","inhoud":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/504849d8-1ae1-4615-9095-a3b452359d10/download?versie=1","bestandsomvang":7,"link":"","beschrijving":"Bijgevoegd
+        document","ontvangstdatum":"2024-03-19","verzenddatum":null,"indicatieGebruiksrecht":false,"verschijningsvorm":"","ondertekening":{"soort":"","datum":null},"integriteit":{"algoritme":"","waarde":"","datum":null},"informatieobjecttype":"http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7","locked":false,"bestandsdelen":[],"trefwoorden":[],"lock":""}'
     headers:
       API-version:
       - 1.4.2
       Allow:
       - GET, POST, HEAD, OPTIONS
       Content-Length:
-      - '1043'
+      - '1047'
       Content-Type:
       - application/json
       Cross-Origin-Opener-Policy:
       - same-origin
       Location:
-      - http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ec46dbda-cbeb-4712-ba70-ea7e28d972c6
+      - http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/504849d8-1ae1-4615-9095-a3b452359d10
       Referrer-Policy:
       - same-origin
       Vary:
@@ -136,11 +136,11 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:30 GMT
+      - Wed, 29 Jan 2025 17:01:17 GMT
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
@@ -152,8 +152,8 @@ interactions:
       message: OK
 - request:
     body: '{"type": "http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2",
-      "record": {"typeVersion": 1, "data": {"single_file": "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/33972655-0307-42f7-a62d-3002d974f2e0",
-      "multiple_files": ["http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ec46dbda-cbeb-4712-ba70-ea7e28d972c6"]},
+      "record": {"typeVersion": 1, "data": {"single_file": "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/e512fb79-ae44-4689-8b93-e1ad3e01eb8a",
+      "multiple_files": ["http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/504849d8-1ae1-4615-9095-a3b452359d10"]},
       "startAt": "2024-03-19"}}'
     headers:
       Accept:
@@ -176,7 +176,7 @@ interactions:
     uri: http://localhost:8002/api/v2/objects
   response:
     body:
-      string: '{"url":"http://objects-web:8000/api/v2/objects/c1c94f2a-3b16-45d0-b77f-0b7641e2532f","uuid":"c1c94f2a-3b16-45d0-b77f-0b7641e2532f","type":"http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2","record":{"index":1,"typeVersion":1,"data":{"single_file":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/33972655-0307-42f7-a62d-3002d974f2e0","multiple_files":["http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ec46dbda-cbeb-4712-ba70-ea7e28d972c6"]},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2024-12-19","correctionFor":null,"correctedBy":null}}'
+      string: '{"url":"http://objects-web:8000/api/v2/objects/0d282033-0d7f-4bb2-a075-41603cc2a89c","uuid":"0d282033-0d7f-4bb2-a075-41603cc2a89c","type":"http://objecttypes-web:8000/api/v2/objecttypes/527b8408-7421-4808-a744-43ccb7bdaaa2","record":{"index":1,"typeVersion":1,"data":{"single_file":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/e512fb79-ae44-4689-8b93-e1ad3e01eb8a","multiple_files":["http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/504849d8-1ae1-4615-9095-a3b452359d10"]},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2025-01-29","correctionFor":null,"correctedBy":null}}'
     headers:
       Allow:
       - GET, POST, HEAD, OPTIONS
@@ -191,13 +191,13 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:30 GMT
+      - Wed, 29 Jan 2025 17:01:17 GMT
       Location:
-      - http://localhost:8002/api/v2/objects/c1c94f2a-3b16-45d0-b77f-0b7641e2532f
+      - http://localhost:8002/api/v2/objects/0d282033-0d7f-4bb2-a075-41603cc2a89c
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components_container_variable.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components_container_variable.yaml
index 39e2ce81ee..5677fb9849 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components_container_variable.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_file_components_container_variable.yaml
@@ -2,9 +2,9 @@ interactions:
 - request:
     body: '{"informatieobjecttype": "http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7",
       "bronorganisatie": "000000000", "creatiedatum": "2024-03-19", "titel": "Form
-      031", "auteur": "Aanvrager", "taal": "nld", "formaat": "multipart/mixed", "inhoud":
+      005", "auteur": "Aanvrager", "taal": "nld", "formaat": "model/iges", "inhoud":
       "Y29udGVudA==", "status": "definitief", "bestandsnaam": "attachment1.jpg", "ontvangstdatum":
-      "2024-03-17", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
+      "2024-03-10", "beschrijving": "Bijgevoegd document", "indicatieGebruiksrecht":
       false, "bestandsomvang": 7}'
     headers:
       Accept:
@@ -16,7 +16,7 @@ interactions:
       Connection:
       - keep-alive
       Content-Length:
-      - '485'
+      - '480'
       Content-Type:
       - application/json
       User-Agent:
@@ -25,22 +25,22 @@ interactions:
     uri: http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten
   response:
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index 8a7d3820a6..08d0b52c72 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2.yaml
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       Date:
-      - Thu, 19 Dec 2024 10:06:17 GMT
+      - Wed, 29 Jan 2025 17:01:17 GMT
       Referrer-Policy:
       - same-origin
       Server:
@@ -156,8 +156,8 @@ interactions:
     body: '{"type": "http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48",
       "record": {"typeVersion": 3, "data": {"age": 20, "name": {"last.name": "My last
       name"}, "submission_date": "2024-03-19T13:40:00+00:00", "submission_pdf_url":
-      "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ed5de000-7692-474a-b9e4-8dbded780e37",
-      "submission_csv_url": "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/7a1d75a4-8fd7-4945-b99d-05fadcd45e0b",
+      "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/cfa06b2d-7bae-46bd-8788-66e7e63f14d5",
+      "submission_csv_url": "http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/51084c9e-e508-45aa-b0f3-dd29b0c200cf",
       "submission_payment_completed": false, "submission_payment_amount": null, "submission_payment_public_ids":
       [], "cosign_date": null}, "startAt": "2024-03-19", "geometry": {"type": "Point",
       "coordinates": [4.893164274470299, 52.36673378967122]}}}'
@@ -182,8 +182,8 @@ interactions:
     uri: http://localhost:8002/api/v2/objects
   response:
     body:
-      string: '{"url":"http://objects-web:8000/api/v2/objects/a73b1bd4-91c0-444b-9241-93b111f83681","uuid":"a73b1bd4-91c0-444b-9241-93b111f83681","type":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","record":{"index":1,"typeVersion":3,"data":{"age":20,"name":{"last.name":"My
-        last name"},"submission_date":"2024-03-19T13:40:00+00:00","submission_pdf_url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/ed5de000-7692-474a-b9e4-8dbded780e37","submission_csv_url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/7a1d75a4-8fd7-4945-b99d-05fadcd45e0b","submission_payment_completed":false,"submission_payment_amount":null,"submission_payment_public_ids":[],"cosign_date":null},"geometry":{"type":"Point","coordinates":[4.893164274470299,52.36673378967122]},"startAt":"2024-03-19","endAt":null,"registrationAt":"2024-12-19","correctionFor":null,"correctedBy":null}}'
+      string: '{"url":"http://objects-web:8000/api/v2/objects/40a7dc15-ee2b-4382-8ebb-dc247ca4bacf","uuid":"40a7dc15-ee2b-4382-8ebb-dc247ca4bacf","type":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","record":{"index":1,"typeVersion":3,"data":{"age":20,"name":{"last.name":"My
+        last name"},"submission_date":"2024-03-19T13:40:00+00:00","submission_pdf_url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/cfa06b2d-7bae-46bd-8788-66e7e63f14d5","submission_csv_url":"http://localhost:8003/documenten/api/v1/enkelvoudiginformatieobjecten/51084c9e-e508-45aa-b0f3-dd29b0c200cf","submission_payment_completed":false,"submission_payment_amount":null,"submission_payment_public_ids":[],"cosign_date":null},"geometry":{"type":"Point","coordinates":[4.893164274470299,52.36673378967122]},"startAt":"2024-03-19","endAt":null,"registrationAt":"2025-01-29","correctionFor":null,"correctedBy":null}}'
     headers:
       Allow:
       - GET, POST, HEAD, OPTIONS
@@ -198,9 +198,9 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 10:06:17 GMT
+      - Wed, 29 Jan 2025 17:01:18 GMT
       Location:
-      - http://localhost:8002/api/v2/objects/a73b1bd4-91c0-444b-9241-93b111f83681
+      - http://localhost:8002/api/v2/objects/40a7dc15-ee2b-4382-8ebb-dc247ca4bacf
       Referrer-Policy:
       - same-origin
       Server:
diff --git a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2_with_payment_attributes.yaml b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2_with_payment_attributes.yaml
index 2bb10d918d..e0ed00c2c5 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2_with_payment_attributes.yaml
+++ b/src/openforms/registrations/contrib/objects_api/tests/files/vcr_cassettes/ObjectsAPIBackendV2Tests/ObjectsAPIBackendV2Tests.test_submission_with_objects_api_v2_with_payment_attributes.yaml
@@ -16,7 +16,7 @@ interactions:
     uri: http://localhost:8001/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48
   response:
     body:
-      string: '{"url":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","uuid":"8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","name":"Person","namePlural":"Persons","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2023-10-24","modifiedAt":"2024-11-25","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/1","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/2","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/3","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/4"]}'
+      string: '{"url":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","uuid":"8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","name":"Person","namePlural":"Persons","description":"","dataClassification":"open","maintainerOrganization":"","maintainerDepartment":"","contactPerson":"","contactEmail":"","source":"","updateFrequency":"unknown","providerOrganization":"","documentationUrl":"","labels":{},"createdAt":"2023-10-24","modifiedAt":"2024-11-25","allowGeometry":true,"versions":["http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/2","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/3","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/1","http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48/versions/4"]}'
     headers:
       Allow:
       - GET, PUT, PATCH, DELETE, HEAD, OPTIONS
@@ -29,11 +29,11 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:31 GMT
+      - Wed, 29 Jan 2025 17:01:18 GMT
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
@@ -70,7 +70,7 @@ interactions:
     uri: http://localhost:8002/api/v2/objects
   response:
     body:
-      string: '{"url":"http://objects-web:8000/api/v2/objects/07716bc2-5ebe-45c9-9d0e-6bcadc4850d4","uuid":"07716bc2-5ebe-45c9-9d0e-6bcadc4850d4","type":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","record":{"index":1,"typeVersion":3,"data":{"submission_payment_completed":true,"submission_payment_amount":40.0,"submission_payment_public_ids":["foo","bar"],"submission_provider_payment_ids":["123456","654321"]},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2024-12-19","correctionFor":null,"correctedBy":null}}'
+      string: '{"url":"http://objects-web:8000/api/v2/objects/1b713a04-69d2-4182-9653-695d3ca5dd27","uuid":"1b713a04-69d2-4182-9653-695d3ca5dd27","type":"http://objecttypes-web:8000/api/v2/objecttypes/8e46e0a5-b1b4-449b-b9e9-fa3cea655f48","record":{"index":1,"typeVersion":3,"data":{"submission_payment_completed":true,"submission_payment_amount":40.0,"submission_payment_public_ids":["foo","bar"],"submission_provider_payment_ids":["123456","654321"]},"geometry":null,"startAt":"2024-03-19","endAt":null,"registrationAt":"2025-01-29","correctionFor":null,"correctedBy":null}}'
     headers:
       Allow:
       - GET, POST, HEAD, OPTIONS
@@ -85,13 +85,13 @@ interactions:
       Cross-Origin-Opener-Policy:
       - same-origin
       Date:
-      - Thu, 19 Dec 2024 08:19:31 GMT
+      - Wed, 29 Jan 2025 17:01:18 GMT
       Location:
-      - http://localhost:8002/api/v2/objects/07716bc2-5ebe-45c9-9d0e-6bcadc4850d4
+      - http://localhost:8002/api/v2/objects/1b713a04-69d2-4182-9653-695d3ca5dd27
       Referrer-Policy:
       - same-origin
       Server:
-      - nginx/1.27.0
+      - nginx/1.27.3
       Vary:
       - origin
       X-Content-Type-Options:
diff --git a/src/openforms/registrations/contrib/objects_api/tests/test_backend_v2.py b/src/openforms/registrations/contrib/objects_api/tests/test_backend_v2.py
index 1c2a05b304..a83129f437 100644
--- a/src/openforms/registrations/contrib/objects_api/tests/test_backend_v2.py
+++ b/src/openforms/registrations/contrib/objects_api/tests/test_backend_v2.py
@@ -10,6 +10,7 @@
 
 from openforms.authentication.service import AuthAttribute
 from openforms.contrib.objects_api.tests.factories import ObjectsAPIGroupConfigFactory
+from openforms.formio.tests.factories import SubmittedFileFactory
 from openforms.payments.constants import PaymentStatus
 from openforms.payments.tests.factories import SubmissionPaymentFactory
 from openforms.submissions.constants import PostSubmissionEvents
@@ -400,6 +401,106 @@ def test_submission_with_file_components_container_variable(self):
         self.assertIsInstance(result["record"]["data"]["multiple_files"], list)
         self.assertEqual(len(result["record"]["data"]["multiple_files"]), 2)
 
+    @tag("gh-4689")
+    def test_submission_with_editgrid_with_nested_files(self):
+        formio_upload = SubmittedFileFactory.build()
+        submission = SubmissionFactory.from_components(
+            [
+                {
+                    "key": "repeatingGroup",
+                    "type": "editgrid",
+                    "label": "Repeating group",
+                    "components": [
+                        {
+                            "key": "nestedRepeatingGroup",
+                            "type": "editgrid",
+                            "label": "Yeah this is madness",
+                            "components": [
+                                {
+                                    "key": "email",
+                                    "type": "email",
+                                    "label": "Email",
+                                },
+                                {
+                                    "key": "file",
+                                    "type": "file",
+                                    "multiple": False,
+                                },
+                            ],
+                        }
+                    ],
+                },
+            ],
+            submitted_data={
+                "repeatingGroup": [
+                    {
+                        "nestedRepeatingGroup": [
+                            {
+                                "email": "info@example.com",
+                                "file": formio_upload,
+                            }
+                        ],
+                    },
+                ],
+            },
+            completed=True,
+        )
+        submission_step = submission.steps[0]
+        attachment = SubmissionFileAttachmentFactory.create(
+            submission_step=submission_step,
+            form_key="repeatingGroup",
+            file_name=formio_upload["originalName"],
+            original_name=formio_upload["originalName"],
+            _component_configuration_path="components.0.components.0.components.1",
+            _component_data_path="repeatingGroup.0.nestedRepeatingGroup.0.file",
+        )
+
+        v2_options: RegistrationOptionsV2 = {
+            "version": 2,
+            "objects_api_group": self.objects_api_group,
+            # See the docker compose fixtures for more info on these values:
+            "objecttype": UUID("8faed0fa-7864-4409-aa6d-533a37616a9e"),
+            "objecttype_version": 1,
+            "upload_submission_csv": False,
+            "update_existing_object": False,
+            "auth_attribute_path": [],
+            "informatieobjecttype_attachment": "http://localhost:8003/catalogi/api/v1/informatieobjecttypen/531f6c1a-97f7-478c-85f0-67d2f23661c7",
+            "organisatie_rsin": "000000000",
+            "variables_mapping": [
+                {
+                    "variable_key": "repeatingGroup",
+                    "target_path": ["repeatingGroup"],
+                },
+            ],
+            "iot_attachment": "",
+            "iot_submission_csv": "",
+            "iot_submission_report": "",
+        }
+
+        plugin = ObjectsAPIRegistration(PLUGIN_IDENTIFIER)
+
+        # Run the registration
+        result = plugin.register_submission(submission, v2_options)
+        assert result is not None
+
+        objects_api_attachment = (
+            attachment.objectsapisubmissionattachment_set.get()  # pyright: ignore[reportAttributeAccessIssue]
+        )
+        record_data = result["record"]["data"]
+        expected = {
+            "repeatingGroup": [
+                {
+                    "nestedRepeatingGroup": [
+                        {
+                            "email": "info@example.com",
+                            "file": objects_api_attachment.document_url,
+                        }
+                    ],
+                }
+            ],
+        }
+        self.assertEqual(record_data, expected)
+
     def test_submission_with_empty_optional_file(self):
         submission = SubmissionFactory.from_components(
             [
diff --git a/src/openforms/typing.py b/src/openforms/typing.py
index 75f1c34395..6719c88075 100644
--- a/src/openforms/typing.py
+++ b/src/openforms/typing.py
@@ -3,7 +3,7 @@
 import datetime
 import decimal
 import uuid
-from typing import TYPE_CHECKING, Any, NewType, Protocol
+from typing import TYPE_CHECKING, Any, NewType, Protocol, Sequence
 
 from django.http import HttpRequest
 from django.http.response import HttpResponseBase
@@ -18,7 +18,7 @@
 
 type JSONPrimitive = str | int | float | bool | None
 
-type JSONValue = JSONPrimitive | JSONObject | list[JSONValue]
+type JSONValue = JSONPrimitive | JSONObject | Sequence[JSONValue]
 
 type JSONObject = dict[str, JSONValue]