Yesterday, I spend a morning trying to figure out why a APK expansion file wasn’t downloading see screenshot. This problem was specifically with and Android app/game created in the corona SDK but I guess could happen to standard Android apps. After reviewing Corona labs docs are here and various forum posts it turned out to be a simple fix.
The expansion file had not successfully uploaded!! 🙁
So triple check the expansion uploaded ok in the Google Play console! We had it fail 3 times for 2 different versions without any error messages.
Check the APK file details you should see the file size includes the expansion file size and see the filename of expansion file.
Official Google play apk expansion docs: https://developer.android.com/google/play/expansion-files.html