Servo gimbal control not working for both RC and Pixhawk

I am trying to integrate the servo gimbal with pixhawk following this document
https://ardupilot.org/plane/docs/common-camera-gimbal.html

I have done all of the changes but RC control is not responding and I am not able to control it with my Tx.

I tried to change servo directly to RC mode it worked with Tx but stop responding with the movement of drone.

I want both function work simultaneously. How can I able to do that.