App Mobile Not Work in Version Android 8.0, 9.0, etc

I need Help! Can help me ?
How to change Version Android after post app in PLay Store ?
I don’t know change the version
my version work only in Android 11.0 +
Only the play store make this, the AppGyver App Tes work in Android 8.0, 9.0 +…

This is my app:

I don’t use features of new versions android

Version Test Work normal in My Smartphone Galaxy J7 PRO

I searched your app and as you said, google told me none of my devices can install this app. Search for a tutorial about uploading an app and see where you missed the steps.