Mission Planner Set Mount - Joystick

Hello!

I am attempting to map some buttons on my USB controller (Gamepad F310) to the “Set Mount” function. I am using this to pivot a Fatshark camera gimbal to neutral and retracted.

However, under “Settings” for the “Set Mount” function, the drop-down box that should allow me to choose “Retract”, “Neutral”, etc. has no items in the drop-down box.

Does anyone have experience mapping a joystick button to this function? Here is a similar question looks like has not been resolved: Mapping a Joystick button to Set Mount

I am using the latest Mission Planner software on Windows. My vehicle is a custom-built quad running Copter 3.6 on a Pixhawk 1. The gimbal is a Fatshark that comes with the 700TVL CMOS camera.

Thanks for the help!