I try to use GoogleMobileAds (tested v3.18 and v4.2.1) in unity2020. Then I found that the unity do not include other AndroidManifest as before.
I check the path Temp/StagingArea/AndroidManifest.xml. It not only missing the GoogleMobileAds AndroidManifest. All the other AndroidManifest are also not included.
I also check the AndroidManifest inside the apk using WinRAR. That realy not including other AndroidManifest. I also try to overriding the Android manifest by puting the AndroidManifest to Assets/Plugins/Android/AndroidManifest.xml but it do not work.
Can you please check if the problem persists in the latest 2020.1 release?
If you’re still able to reproduce the issue, I recommend to create a new project that only contains the files to reproduce the problem and then submit a bug-report as described in this document:
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@LeonhardP Could you perhaps find out if the fix is being back-ported to 2020.1? A link to the public issue tracker item would be useful too, so we can keep track.