Updated NextCLoud Windows app now I get error message when opening files "Invalid PDF structure"

I have been using NextCloud on my Windows computer and the Desktop app of NextCloud to save my files to the cloud. I was using an old NextCloud app that was about 2 or 3 iterations from the latest version (Latest: 3.11.0-x64). When I updated to the latest version of NextCloud on my windows computer, now my files that were uploaded are giving me an error and I can’t open them. For PDF files, I get this error - “Invalid or corrupted PDF file” – “PDF.js v2.15.349 (build: b8aa9c622) Message: Invalid PDF structure.” I need help opening my files again.

Are these files okay server-side still? That is, what happens when accessing them from the web UI/client?