- Export keystore from AI2
- import it to the AI2 test server
- import your project (aia) with the same project name in the AI2 test server
- set the VersionCode to n+1
- (build the APK and check if it is possible to be installed on Android 12; if not → report)
- build the AAB
- upload the AAB to the Play Developer console as an internal test track (internal testing)
- wait for the Pre-Launch report (1-2 hours)
- if there are no errors / warnings, download the APK from the Play Developer console
- test this APK on your test devices
- if there are (also) no issues, release the app as a production version.
See also here and read the entire thread.