Transfer my progress through a other device – Real Steel Review

Why is it so difficult to transfer data to a other device? I’m trying to transfer data to another device, but I have a android phone and a iPad, I don’t how I can transfer that easily. It will be easy to put login with Facebook that’s says “Save your progress” and “Play on multiple devices” like real steel champions.
Review by CupheadPro3785 on Real Steel.