a sandbox to share documents, sender has no need to save the phone number that's slow and tedious. On the other side of the screen, the receiver's desktop will be free from the ever growing, pyramid of files, that he would later need to clean by picking each files manually with the fear of deleting something useful!
scan the qr, it would take you to "upload documents" page. upload your documents. the receiver will receive every bit and bytes of them.