Google Play Internal App Sharing

Play core in-app updates.txt

* To test in-app updates the app must be released at least once before to any track
* The application ID must match, but the signature doesn't since Play Store has its own signature for apps shared via Internal App Sharing links
* If the app has custom country availability, which happens to not include the country of the tester, a new track must be create
with a custom country availability that includes also the country of the tester. In case this is not followed, the tester will
see an error related to purchase not available in his country.
* When using test tracks, the testers Google account must be in the testers list and they must opt-in.
* Upload the test build to https://play.google.com/console/internal-app-sharing
* The tester must download and install the app at least once from the Internal App Sharing before testing in-app update
* Once the app is installed at least once, the tester should open the new link, but not install the update from there. Instead
he should navigate to the app and test the in-app update from there.