Blank/empty attachment in preview mode

Hello, I have uploaded some PDF files to a spreasdheet; if I download them, they are ok, but if I open them in preview mode their content does not appear, the document is blank. This is happening with a few PDF attachments, but not with all of the attachments of the sheet and I can't understand why.

Does anyone have a suggestion to fix this?

Many thanks

Francesca

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