Sync cross platform, for example between android and windows :

1- not real-time exactly

2- sometimes has issues, but it should sync without issues as it by itself should consider changes from both sides and can merge without lose any one, just merge both.

3- sync why cant occurred in background? should i always open app in both cross platform devices and wait seconds until they sun=yced ! this effect real-time syncing.

4- if can improve flexibility specially for mobile app