I've created an application using MIT AI2 and have published it on Google Play using Google's generated sign-in. Now, I'd like to also upload the APK file to my website for users to download directly. To ensure consistency, I need to use the same keystore as the one generated by Google. Is there a way to export the keystore used by Google Play?
I do not think this is possible. The Google-generated keystore isn't exportable from Google for security reasons. If you want to be able to sign your own APKs, you have to generate the keystore yourself and then upload it to Google Play Console.