touchscreen

I bought a FeelWorld 10" external touchscreen monitor (2000 nit) to use with the RC Pro. I havn't been able to use touchscreen feature which is a bummer. I guess the RC won't honor touchscreen input over HDMI. Has anyone else figured out how?

Out flying my new (4 days old) Mavic when the camera started looking up / down / up... managed to land safely. Now when I connect my phone to the controller, the screen says [1x] in the center, and the touch screen on my iPhone is unresponsive. Can't press anything. Shut phone off...