Failed to drive servo with aux output1

i tried to use aux1-4 outputs to drive four servos ,but not work,how to set up from the beginning.
the airframe is Generic Quadcopter x
the version of px4 software is 1.12.3dev.
use the QGC

I’d try it with v1.14 (beta or daily) and the actuators tab in QGC.

thanks,i want to control the servo with the radio ,but i can’t find the pwm in mavlink and i don’t konw how to change the pwm

Are you trying to get a PWM output or a DC voltage to control your relay? I was only able to get a PWM output and then had to get a PWM to DC converter.

yes,u should add an UBEC in pixhawk to provide voltage for servo