What you’re seeing
- Files in a synced SharePoint folder show an "upload blocked" status in the OneDrive activity panel.
- Changes made on the PC never appear for colleagues in SharePoint.
- OneDrive's icon shows a red error and a growing list of unsynced items.
- The same file uploads fine through the browser but not through the synced folder.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- The user's permission on the library was reduced to read-only, but the folder is still synced as if they could edit.
- The file is open in an Office app that cannot hand it off to OneDrive, often because Office's upload integration is off or conflicting.
- The library requires check-out or mandatory metadata columns, which the sync client cannot satisfy automatically.
- The file type, name or size is blocked by SharePoint or by a tenant policy.
- Another user has the file checked out or locked, so the sync client cannot write the new version.
Why it matters
The danger with upload-blocked files is that the user believes their work is saved and shared when it isn't. Colleagues keep working from outdated versions, and if the PC fails or is replaced, the unsynced changes disappear with it. For teams that rely on synced libraries instead of a file server, a blocked upload is effectively an unseen data loss risk.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
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A certified engineer diagnoses it
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Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
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Frequently asked questions
Are the files that won't upload lost?
Not yet. They are still on the local PC, which is why it matters to resolve this before the computer is reset or replaced.
Why is only one library affected?
Library-level settings such as required columns, check-out, or a changed permission are the usual culprits, so other libraries sync normally.