Overview
Error 9403 appears when Sync is unable to preview a file in the web panel. This is typically caused by a browser-related issue or a temporary loading error.
Note: This error only affects file previews. You can still download the file using the Download button in the web panel.
Troubleshooting Steps
Try the following steps to resolve the issue:
-
Open Sync in a private/incognito window
This disables browser extensions and clears cached data that may interfere with file previews. -
Sign out, then sign back in
A fresh session can resolve temporary session-related issues. -
Temporarily disable browser extensions or ad blockers
Some extensions (especially privacy or security plugins) may block file previews. -
Try a different browser
This helps determine if the issue is browser-specific.
Still having trouble? Contact support.
If the error continues after you've completed the troubleshooting steps, contact our support team with details about what took place when the error occurred so this can be investigated further.