Sync Isn't Currently Working
Dropbox Software
Severity: MinorWhat Does This Error Mean?
Dropbox 'Sync isn't currently working' is the umbrella message the desktop app shows when it has fallen behind and can't catch up.
Files in the Dropbox folder still open and edit normally — the cloud just isn't matching them right now.
Most cases come down to one stuck file, a permission issue on a folder, or a busy day for Dropbox itself.
The app usually recovers on its own; if not, the steps below force it.
Affected Models
- Dropbox desktop on Windows 10 and 11
- Dropbox desktop on macOS
- Dropbox desktop on Linux
Common Causes
- One specific file is locked open by another app
- A file or folder name contains a character Dropbox can't sync (colon, pipe, trailing dot)
- NTFS permissions on the Dropbox folder are wrong after a profile move
- Antivirus has the file briefly held during a scan
- Account is over its storage limit (sync stops cleanly when full)
How to Fix It
-
Click the Dropbox icon and read the message.
The tray icon shows which file is blocking sync.
If it lists a specific filename, that's your starting point.
If it just says 'sync isn't working' with no file, the issue is at the folder or account level — go to step 4. -
Close the listed file in any app that has it open.
Word, Excel, Photoshop, even File Explorer with a file selected for preview can hold a lock that blocks sync.
Close every app that touches the file, including the preview pane.
Wait 10 seconds — Dropbox retries automatically and usually catches up. -
Check for forbidden characters in filenames.
Dropbox doesn't sync files with these in the name: / \ < > : * ? | " or trailing dots.
Find the file (Dropbox usually names it in the error), rename it (remove the bad character), and sync resumes.
Common culprits: photos exported with timestamps using colons (12:34.jpg). -
Check storage isn't full.
If sync stopped and you see no specific filename, you may be over quota.
dropbox.com → Settings → Plan.
If you're at 100%, that's your answer — free space or upgrade.
Sync resumes within minutes once you're back under the limit. -
Restart the Dropbox app.
Right-click the Dropbox tray icon → Quit Dropbox.
Wait 30 seconds.
Reopen Dropbox from the Start menu / Applications folder.
Restart clears stuck retry queues and works for many transient sync failures. -
If a folder is permanently stuck, run a sync repair.
Open Command Prompt and navigate to the Dropbox program folder.
Run: dropbox.exe /resetsync
(macOS: same flag from Terminal in the Dropbox.app contents).
This rebuilds the sync state from scratch.
Takes a long time on large accounts but fixes deeply stuck folders.
Frequently Asked Questions
If sync isn't working, am I losing changes?
No — local edits are saved on disk.
When Dropbox catches up, all your changes upload at once.
The risk is if your hard drive fails between the edit and the sync recovering.
If the alert has been on for hours, copy critical files to USB or another cloud as a safety net while you fix the sync.