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Download before restoring — always safer, because restoring overwrites the current state and you want to keep the option of comparing.

Don't blindly hunt the Drive cache — Google Drive for Desktop's cache is not a plain folder of readable files. In Stream mode, files are placeholders and content lives in an opaque cache database (not user-browsable in a meaningful way). In Mirror mode, files are real local copies. We need to know which mode you're in before going down that path.

Google Drive in the browser

Please do this exactly:

1. Open a browser and go to drive.google.com
2. Log in with the account that owns or has access to the file
3. Navigate to the folder containing your corrupted spreadsheet
4. Right-click on the file (do not double-click / do not open it)
5. Tell me exactly what options appear in the menu

I specifically need to know whether you see any of these:

• File information (sometimes expands to a submenu)
• Manage versions
• Version history (may be under File information or under a "⋮" / three-dot menu)
• Share
• Download
• Make a copy
• Rename
• Move to
• Move to trash
• Open with
• Details / View details
• Anything mentioning Activity or Revisions

The exact wording depends on:

• Your Google account type (personal Gmail vs. Google Workspace)
• Whether the file is owned by you or shared with you
• Whether it's a native Google Sheet or an uploaded .xlsx