[FAQ] Why is my data not synced between devices?

Please check if the same account is logged in when enabling "Auto-sync data" or clicking "Sync now" on all your devices. You can "Log out" to change the account.
Make sure the internet connection is stable, then click "Sync now" to make it sync again. If the syncing message disappeared automatically, the data is synced successfully.
Please also check if the epub files are not different versions of a book on your devices. Data will not be synced between different versions of a book.
You can enable the "debug log" and "mail me" it so that I can check if there are some failures during synchronization.