Adding camera gimbal to Gazebo Garden simulation

I’m trying to add camera gimbal to the x500_mono_cam example model.
Running Gazebo Garden and ROS2 humble.

I modified the model to add a joint and a controller. In PX4-Autopilot/Tools/simulation/gz/models/x500_mono_cam/model.sdf,
from the fixed joint,

    <joint name="CameraJoint" type="fixed">
      <pose relative_to="base_link">.12 .03 .242 0 0 0</pose>

I changed it to revolute, controlled by a servo:

   <joint name="CameraJoint" type="revolute">
      <pose relative_to="base_link">.12 .03 .242 0 0 0</pose>
        <xyz>0 1 0</xyz>

      filename="gz-sim-joint-position-controller-system" name="gz::sim::systems::JointPositionController">

I have also set Servo function to gimbal pitch in the frame config, in:


param set-default SIM_GZ_SV_FUNC1 421

When I run simulation, In “Actuators” tab in QGC I can see the gimbal pitch control slider, but when I move the slider camera does not move.

Am I missing something, or doing something wrong?