PDF wont open

I had a client send me pdf copies of documents. We downloaded them all and placed in a gdrive file. Now, when I attempt to open them they all say that they cannot open because it says "adobe cannot open pdf because it is either not a supported file type or because the file has been damaged". However this came right off a thumb drive where it opened. HELP please.

TOPICS

Edit and convert PDFs , General troubleshooting , Modern Acrobat , View PDF