When developing for Android devices, you have several Texture Compression options to choose from. You can also identify 16-bit, 32-bit, or 32-bit half resolution as the ETC2 fallback. You can use the internal Build System or Gradle, which is a build tool used in Android Studio and elsewhere:

You will also decide whether this is a development build or not. If it is, you will have the additional options of Autoconnect Profiler, Script Debugging, and Scripts Only Build.