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.