Well, from what I can tell it seems like the Literadio 2 simply doesn't support joystick emulation on Android.
I have now heard from several people who have the same issue. Works on Windows, not Android.
(Your Xbox controller should work though)
same here, my Betafpv LiteRadio 2 SE is not detected on a recent android 10 phone (nokia 6.2) with OTG cable who work with all other device (usb key, keybord, ...)
Thanks for reporting
