ios – Why is game progress not syncing even after logging in with facebook?

I have an iOS device that has some game data I want to transfer to an Android phone. Someone said that you can transfer data through different platforms if the game can connect to facebook in this thread. So I logged into facebook on the iOS device and then logged into the same account on the android device. However, the game data is still completely different. I don’t know what I’m doing wrong. Can someone please help me?