The 0x800701DB error typically appears when the Sync desktop app is not running and you try to open a cloud-only (placeholder) file from your Sync folder. Since the file exists only in the cloud, the app must be active to download and open it.
How to fix this:
Restart the Sync desktop app:
Look for the Sync icon in your system tray (Windows) or menu bar (macOS).
If the icon is missing, launch the Sync desktop app manually from your Start menu (Windows) or Applications folder (macOS).
Wait for the app to verify and reconnect. You should see a green checkmark or "In Sync" status once complete.
If the error persists after restarting, continue to the next step.
Fully uninstall and reinstall Sync:
A clean reinstall ensures all Sync components are correctly configured.
Download and run the Sync full uninstaller to completely remove the app.
Rename or delete your existing Sync folder (this allows the installer to create a fresh one).
Download and reinstall the latest version of the Sync desktop app from the Sync download page.
Once installed, allow the Sync app to reindex and complete syncing. You’ll know it’s finished when you see a checkmark on the Sync icon in your system tray or menu bar.
Still having trouble? Contact support.
If the issue persists after following these steps, please contact our support team with details about what took place when the error occurred so this can be investigated further.