CHDK Camera Trigger Configuration

I have a 3DR X8+ and I purchased the mapping package. Using the supplied camera trigger cable, the directions are to connect it to it to AUX6 of the Pixhawk and change the following settings in Mission Planner:

CAM_TRIGG_TYPE: 1

CAM_DURATION: 1

RELAY_PIN: 55

LOG_BITMASK: 43006

Everything works find with this configuration, but I want to connect a Lidar Lite which states that it must use AUX6 & AUX5, so I want to move the camera trigger to AUX4.

When I move the camera trigger cable to AUX4 and change the RELAY_PIN parameter to 53 but the camera doesn't trigger.  Anyone have any idea what I'm doing wrong? I included a picture of my PixHawk with the camera trigger cable connected to AUX6.

X8Plus PixHawk.jpg

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