ID: 988063904 / PDF-file deleted

I am reposting this issue as I only recieved the ID just now. I lost several pdf-files and have no idea how that took place.

"PDF.js Version 2.8.0 (build: fdde957) Message: Invalid PDF structure.".

Can anyone help out?
  • If Zotero PDF reader shows this error, the file is either empty or corrupted.

    Are you syncing files to Zotero cloud storage?
  • Yes I am syncing files to Zotero cloud storage and using it on my MacOS and in parallel on my work Windows10.

    This happened with several pdf-files so far and I am not sure why the files should be empty or corrupted...
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