@Anonymous
Here's some instructions on how to do that:
1. Create a new Sharepoint List called AppUsers. This table should have a column called UserEmail.
2. Open PowerApps and connect to your new AppUsers table.
3. Put the following code in your App OnStart property. If the current User() email is not found in the AppUsers SP List your app will navigate to the 1st time introduction screen and then add the User() email to the AppUsers SP List.
If(
IsBlank(LookUp(AppUsers,UserEmail = User().Email)),
Navigate(your_first_time_app_screen,None),
Patch(AppUsers,Defaults(AppUsers),{UserEmail: User().Email})
);
Let me know if you have any questions
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