Sometimes your security token or session expires on a third party storage provider like Dropbox or Google Drive. Usually this is seamlessly renewed but it can happen sometimes that this goes wrong.
To fix this you need to clear your (Dropbox/Google Drive/OneDrive) session. You can do that by:
- Go to Preferences (Gear icon in the top right)
- Scroll to the Cloud section
- Tap Sessions
- Tap ‘Unlink Dropbox’ or similar for other providers
Now when you tap on your database to unlock you’ll be taken through the re-authorization sequence and your session will be renewed.