Link Firebase with Google Analytics first.
Login to Google Analytics.
Go to Admin
Go to Account
Select Create a new property.
Creating a new property will provide you with a Tracking ID.
When your initial property is created, we will also create a default view that will gather all data associated with the tracking code. If you would like to gather only a subset of the data for this code, you will probably want to create a second reporting view, and you will need to create and apply one or more view filters to this data."
Select Mobile App
Select the app from the list. If you are unable to find it, check Firebase.
Select Connect App
You have successfully connected the app.
Go to All website data.
Select the mobile app.
Select "Take Me to Analytics".
You can see all the data in Google Analytics Now.
Watch Video Tutorial on How to Add a Mobile App to New Property on Google Analytics
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