SHELL

flutter step to release appbundle

keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload

flutter build appbundle

android {

    compileSdkVersion 31

    compileOptions {
       ...
    }

   ... ...

    defaultConfig {
        ...
        minSdkVersion 28
        targetSdkVersion 30
       ...
    }
}