Can't open select Google docs or sheets

Hello,

I've been using Dropbox Business integrated with Google Workspaces for over a year. While the integration between Google and Dropbox can be glitchy, my team appreciates the ability to store Google Docs & Sheets in Dropbox with the rest of our files and work on them simultaneously.

Last week, we lost access to several files, receiving the error message below when trying to open select Google Docs & Sheets. I cannot restore these files to a previous version or download them -- they seem to be gone entirely/inaccessible. I called Dropbox help, and they were unable to resolve the issue, citing it as a problem with the third-party app (Google). 

It's clearly an issue with the integration between the two parties, so I'm frustrated that Dropbox can't help any further. 

I've tried clearing cookies & cache, signing out of Dropbox & Google accounts, and restarting my computer, but this did not help.

Any ideas about how to retrieve these files, what the issue could be, or how to best access someone at Google who will understand how these files integrate with Dropbox to be able to troubleshoot successfully?

I'd appreciate any help, thanks!