Individual 2020 Return.  No critical diagnostic alert shown - E- file transmission failure.  
The error message read: "Please check and re-upload following file list, as it seems following file(s) are corrupt or not available now: 1-Form1040.pdf,2-Form1040.pdf".  I cannot figure out how to fix this.  

The ProConnect Online auto-corrected my client's SSN.  The SSN grayed out and not available for edit.  Then I followed the solution to copy the 2020 return, correct the SSN, and submitted the refund request, then E-File the new return.  I did not delete the original return as the original return name was submitted as part of the refund requests, so I think some one will need to look at it.  

I do not understand what to do to file the new return with the SSN fixed.  Please help.