When Microsoft 365 apps like Word or Excel show the error:
“Upload Blocked. We ran into a problem with this file and can’t save any new changes. Please save a copy to avoid losing your work.”
…it prevents you from saving files directly to OneDrive. This usually happens when your Office account and OneDrive account don’t match, or when credential or sync issues block file uploads.
Below are step-by-step methods to resolve this issue and restore seamless saving and syncing.
Method 1: Match Office and OneDrive Accounts
Using different accounts in Office and OneDrive often causes upload conflicts. Ensuring both use the same Microsoft account resolves this.
1- Click the OneDrive cloud icon in the taskbar > Help & Settings > Settings.
2- In the Account tab, note the signed-in account.
3- Open the affected Microsoft 365 app (Word, Excel, etc.) > File > Account.
4- Under Connected Services, remove all accounts except the one from Step 2.
5- Pause OneDrive syncing (Help & Settings > Pause syncing), quit OneDrive, and close all Office apps.
6- Restart OneDrive and the Office app, then try saving again.
Method 2: Remove and Re-Add OneDrive in Office
Refreshing OneDrive’s connection in Office often clears credential problems.
1- Open the Office app > File > Account.
2- Under Connected Services, remove the OneDrive service.
3- Click Add a service > Storage > OneDrive.
4- Sign in with your Microsoft 365 credentials.
5- Reopen the file and save it to OneDrive.
Method 3: Clear Cached Credentials
Corrupt or outdated cached credentials can block uploads. Clearing them forces a fresh sign-in.
1- Close all Office apps.
2- Open the Start menu, type Credential Manager, and select it.
3- Go to Windows Credentials.
4- Remove entries for OneDrive Cached Credentials, MicrosoftOffice16, and MicrosoftOffice15.
5- Restart OneDrive and Office, then sign in again.
Method 4: Reset the OneDrive App
If OneDrive itself is misconfigured, resetting the app can fix sync failures.
1- Press Windows + R, type: %localappdata%\Microsoft\OneDrive\onedrive.exe /reset and press Enter.
2- Wait for OneDrive to restart. If it doesn’t, open it manually from the Start menu.
3- Sign in and check if syncing resumes.
Method 5: Check File Permissions
If a file’s permissions don’t allow editing, Office may block uploads.
1- Go to onedrive.live.com and sign in.
2- Find the problematic file or folder.
3- Right-click > Manage access or Sharing.
4- Ensure your account has Edit permissions or ownership rights.
5- If shared, confirm no changes were made to block your access.
Method 6: Update Windows and Office
Outdated software may cause sync errors. Updating ensures the latest bug fixes are applied.
1- In Windows, open Settings > Update & Security > Check for updates.
2- Install all pending updates.
3- Open an Office app > File > Account > Update Options > Update Now.
4- Restart your PC and test file saving again.
✅ Final Tip: If none of these methods work, consider unlinking and re-linking OneDrive completely or contacting Microsoft Support for deeper troubleshooting.
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