It's been so long since I develop a mobile app in react native, when I'm developing before, I usually generate a release apk and send it to my clients so that they can test it and have experienced it, but now when I build a release in react native, it returns a .aab instead of .apk, how can I send my application to the clients when I only get .aab format on my project?
It using for different android devices installation by google play store. that's why you can use apk build for manual installation.
You must use the below command for the testing build.
$ cd android
$ ./gradlew assembleRelease