I'm not sure if I clearly understood you question.
The sharing is on Mi app only on iOS. Not sure about Android.
If your device is on China locale, and you share with someone else on another locale ie Singapore, it will not work. Last time when I tested this, both accounts need to be on same locale.
I really hope when they do add updated Singapore server, there's data sync in background so as user we can seamlessly switch between locale instead of adding everything again.