Access to file denied

While trying to open any PDF, I get an “Access to file denied.” error.
I think I’ve logged into my Google Drive, as I can see all the files. Perhaps there’s another way to check?
Anyone else seen this error?

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Yes - an also getting this. I cannot annotate with anything!

Try opening the file with our built-in viewer. To activate it, go to the Browser Integration tab of the settings menu (upper right) and set your PDF viewer to “Viewer with annotations (beta)”.