How to Fix OneDrive for Mac Uploads Stuck at 100 Percent
Question details
Users experience an issue where large files uploaded to OneDrive for Mac reach 100% completion but do not appear online, often resetting when the app or system is restarted.
- Product
- OneDrive for Mac
- Device & OS
- macOS
- Scenario
- Uploading large video files (5-20 GB) to OneDrive on a Mac computer.
- Observed behavior
- The upload progress bar hits 100% but the file fails to finalize and appear online. Restarting OneDrive or the Mac causes the upload progress to regress to an earlier percentage.
Ensure you have a stable and fast internet connection, as dropping connections during large file transfers (5-20 GB) can cause the sync engine to stall even when the progress bar shows completion.
Upload Files Individually and Verify Network Settings
Uploading large files one at a time prevents sync queue congestion and helps identify network interruptions.
When transferring massive video files, processing them in batches can overwhelm the synchronization engine or trigger timeouts. Uploading them individually ensures the server can finalize each file completely.
Click the OneDrive cloud icon in the Mac menu bar, click the gear icon (Settings), and select 'Pause syncing' for 2 hours.
Move all the large video files currently trying to sync out of your local OneDrive folder to another location on your Mac, such as the Desktop.
Temporarily disable any third-party antivirus or strict firewall software, as these can block the final upload confirmation packets.
Resume OneDrive syncing. Move a single large video file back into the OneDrive folder and wait for it to fully sync and appear online before adding the next file.
Isolate the Issue Using Mac Safe Mode or a New User Profile
This helps determine if background applications or user profile corruptions are interfering with OneDrive.
Update the OneDrive App
Running an outdated version of OneDrive can cause syncing bugs, especially with large file handling.
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Frequently Asked Questions
What is the maximum file size I can upload to OneDrive?
OneDrive supports individual file uploads of up to 250 GB. Files between 5 and 20 GB are fully supported, provided your internet connection is stable enough to complete the transfer.
Why does my OneDrive upload regress to an earlier percentage after restarting my Mac?
If an upload gets stuck at 100% and fails to finalize with the server, restarting the app or your Mac forces the sync engine to re-evaluate the file. It will typically resume uploading from the last successfully synced data chunk.
Can firewall or antivirus software cause OneDrive uploads to stall?
Yes. Strict network security tools can sometimes intercept or block the final confirmation packets of a large file transfer. Temporarily disabling them can help you determine if they are the root cause of the syncing issue.
