I just updated my old projects to as3.0 and builded and signed my app. After when I want to upload to google play:
\"you can not upload a test only apk\"
Any
If you have set up the build file to automatically sign your release, then you can also use
Build > Build APK
to configure the auto sign, the link is below. (https://developer.android.com/studio/publish/app-signing.html#secure-shared-keystore)