Reference:
- Apple: https://developer.apple.com/app-store-connect/analytics/

- Google: https://play.google.com/console/about/stats/

To view your mobile app analytics you must request access to the App Store and Google Play store dashboards. Use this form: https://go.peoplevine.com/form/4604.

Once your form is filled watch out for two invitations in your inbox, one to the App Store and another for the Google Play store.

Login to https://appstoreconnect.apple.com/ and navigate to the analytics page.

There you should see your app listed.

Refer to Apple documentation for detailed usage of Analytics dashboard: https://developer.apple.com/app-store-connect/analytics/.

Login to https://play.google.com/console/developers and navigate to your app.

Once your app is selected, navigate to the Statistics dashboard.

Refer to Google's documentation for detailed usage of app statistics: https://play.google.com/console/about/stats/.