Google now also recommends a new package file format, Android App Bundle (aab), instead of the usual packages (apk), when uploading to Google Play.
I found it hard to find documentation on exactly how to do the uploading from Unity/3D.
After some trial and error these were my settings.
Player settings/other settings:
IL2CPP has to be chosen instead of Mono. ARM64 must be checked. x86 has been deprecated from version 2019.2.2.
API-level has to be at least 21. If you can't set the API-level (common error reported in the Unity forums) try changing API compatibility level and then change it back. It worked for me.
I hope this can be of help to someone. Please comment if you think I missed something.