During the day I play on my phone and at night I play on my tablet, but sometimes when I log into the game on my tablet all of that day's progress from my phone has not been updated. I can log out then log back in but it doesn't matter, I don't get any option to sync my tablet's progress with the server.

I log out of my Ubi account, force close the app on my tablet, open it on my phone and my day's progress is there. I log out of my Ubi account then log back in again, meaning the app MUST be communicating with Ubi's servers, check to see I do actually have a connection (which I do), force close the app on my phone, re-open the app on my tablet, log back into my Ubi account, but my save game remains in the past and there is NO option to sync my tablet with the server.

I have on very rare occasions been presented with the option to choose a save state when syncing my device with the servers, but it's very rare, and does not seem to be prompted by any one thing I do. I can burn through an entire tank of fuel while logged into my Ubi account with an active data connection and not once does the game offer to sync/update my device's progress with that from the server, or vice versa.

At the very least, logging out of your Ubi account then logging back in should prompt the save game sync.