Installing Engine Manually

Google and Android are increasing the security with Android 10.0 and no longer allow to execute `exec()` on files within the app's home directory which means one can't install chess engine manually (with binary/executable files) on android chess apps.

And starting November 2020, all Apps will be forced to target the new API 29 (i.e. Android 10), which means no app will support installation of external chess engine files with binary files

You can read more about it at https://developer.android.com/about/versions/10/behavior-changes-10