I am facing the same issue. My EPFO office, when I was employed in a company, is zoned in the KR PURAM EPFO office. On calling the KR PURAM SSA contact number ([Phone Number Removed For Privacy-Reasons]), I found that the documents we are trying to upload would be needed by the EPFO Commissioner in physical form. Instead of solving the technical issues, there is too much bureaucracy, as expected at EPFO.
To add more to the irony, the person who attended the call dropped the phone immediately when I was asking for details of what should be enclosed in the physical document proofs of my employment, cover letter, grievance, transfer claim, and everything related to it.
I seriously don't understand, are we ruled by some babus, or is this a free world?