Flutter Release apk is not working properly?

Question

I had run this flutter build apk to release my App. Now I had build verison 2 of that.

Now again I want to release my version 2 App.To get the release apk

Answer 1

I got the release APK which is not working good named as app-release.apk but just in the folder previous to that one there is another apk app.apk which do not have that debug strip at top and working fine as in debug mode and size is almost same.