I didn't think this was a thing, but then had a user request controller support for my iOS/Android game.
I added the plugin in C3 and it works nicely in Windows, but as soon as I export to Android and try using my controller, the game doesn't recognise it (the device is recognised by the phone though, can move around and select items on the phone's home screen).
Tried with both a Xbone and PS4 controller. Only tested on Android as I don't own an iphone.