How to connect our own app one account with another account? - flutter

I hope i will find the great answer from you
I am currently working on an app i want that app to work remotely
For an instance,
I press a key in my app(account) it reflects in another app(account)
Using flutter

To connect one flutter app to another you need some way to access shared data ie a database, you can use a few different ones, firebase is a good start. your question is very vague.

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The library flutter-auth-ui provides UI for Firebase authentication.
See how it works here.

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Thanks.
Your question is: How does iCloud work. Too broad. http://developer.apple.com
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The example app you name (mindjet) seems to be using dropbox for its file service.
http://www.dropbox.com/
This article explains this in great detail:
http://www.raywenderlich.com/1980/how-to-import-and-export-app-data-via-email-in-your-ios-app