If you want to sync your progress on the mobile app with your Facebook account, make sure to log in with Facebook when you first download the app.
If you’ve been playing the app as a Guest, you can turn your guest account into a Facebook account as long as no Facebook, High 5 Casino, High 5 Vegas, Electri5 Casino, CATS Casino, Golden Goddess Casino or Da Vinci Diamonds Casino account currently exists. Once you connect your progress will be synced to your Facebook account moving forward.
If you have a current Facebook account you play with on desktop, and you try to sync your Guest account to your Facebook, you will lose all your progress as a Guest.
You can always turn your Guest account into an Email account as long as no email account with the email address exists.