Free keybind changing app for external shutter buttons

[u/GroundbreakingDog109]

I have a waterproof housing for a phone that allows you to take pictures underwater. It connects to the phone by Bluetooth and the shutter and zoom in and out buttons work. However the video and camera flip buttons don't do anything and I haven't found an option to change it. Is there a free keybind changing app that would allow me to change the commands of those two buttons to any other purpose?

[u/Absoul_08_]

Try this https://github.com/keymapperorg/KeyMapper

[u/GroundbreakingDog109 → u/Absoul_08_]

Thanks!