When I upload my aab file i get this error : Play installer check requires a minimum SDK version of 21 or higher. The uploaded App Bundle has a minimum SDK version of 7. Update the minSdkVersion in your app's Android manifest.
I don't know either but I'm sure one of my colleagues will. Let's hope you can keep version 7 as the minimum. Shame on Google that their install checker can't work with more devices (there are millions of them).
If I'm not wrong, if you decompile the abb file and go to the AndroidManifest.xml if you find a thing called android:minSdkVersion and there you can edit the minimum SDK version