Missing files from OneDrive Documents on macOS following OneDrive reinstallation and an unexpected ~69,000-file deletion/movement notification.

Start with the locations most likely to still contain the missing files before making any more cleanup changes.

1. Check OneDrive on the web first.
   This is the recommended starting point for missing files because it is the central copy that devices sync with. Confirm whether the missing Documents files exist online.
2. Check the current local OneDrive path on macOS.
   On macOS 12.1 and later, the OneDrive folder location moved to: Library > Cloud Storage > OneDrive
   Older shortcuts or aliases may still exist in the previous location, so recent files may appear missing if Finder or Office is pointing to the old path.
3. Search local storage outside OneDrive.
   Because some files may not have finished syncing before the reinstall, search in Finder across the Mac, not only inside OneDrive. Also check Trash. This is especially important for files that were saved locally in the OneDrive Documents folder but never reached OneDrive Online.
4. Re-link the existing OneDrive folder if prompted.
   Open OneDrive with Spotlight. If prompted that a folder already exists, select Use this folder so the client reconnects to the existing local folder instead of creating a different location. After sign-in, OneDrive syncs files back to the Mac, though placeholders may appear first and full download can take time.
5. If the reinstall left behind multiple OneDrive folders, verify before removing anything.
   A leftover folder can contain files that are no longer part of the active sync location. Compare any older or duplicate OneDrive folders with the active folder and with OneDrive on the web. Do not delete any leftover folder until it is confirmed that it contains no unique files.
6. If the issue matches a Files On-Demand migration problem, reset OneDrive.
   If OneDrive shows the error “A required system component is unavailable on this version of macOS”, the documented fix is a reset.

Warning: Resetting OneDrive removes all local content. Anything not synced to the cloud may be lost.

Reset steps:

• Open Finder and go to Applications.
• Right-click OneDrive and select Show Package Contents.
• Open Contents > Resources.
• Run ResetOneDriveAppStandalone.command.
  Depending on the version, the file may be ResetOneDriveApp.command.
• Launch OneDrive and set it up again.

7. If AutoSave or recent Office files are involved, re-save to the new OneDrive location.
   Because the OneDrive path changed on macOS, Office AutoSave can stop working until files are saved again into the new OneDrive folder using File > Save As.
8. If the files are still missing after these checks, use the correct support path for the account type.
   For a work or school account, contact the organization’s IT helpdesk or admin. For a personal account, use Contact Microsoft Support from the support flow.

Given the reported reinstall, intermittent sync, and the large delete-or-move notification, the highest-value recovery checks are:

• OneDrive on the web
• Library > Cloud Storage > OneDrive
• Finder search across the whole Mac
• any duplicate or leftover OneDrive folders
• Trash

• Find lost or missing files in OneDrive | Microsoft Support
• Missing files and autosave issues with OneDrive on macOS | Microsoft Support
• Fix OneDrive sync problems on Mac | Microsoft Support
• Fix OneDrive Files On-Demand issues on macOS 12.1 or later | Microsoft Support
• Multiple OneDrive folders on MacOS - Microsoft Q&A