It is not possible to get an upgraded ots file from the website

[Udala]

Having the possibility of downloading an upgraded ots file is paramount. This is especially important for non-technical people who don't use the command line.

AFAIK the website does not provide the possibility of getting a "true" receipt, i.e. with full proving capability without relying on trust: only the document, the ots file and the Bitcoin blockchain.

[petertodd]

I think this is a good idea!