CAM_TRIGG_DIST on 3 cameras?

My fixed wing successfully mapped using PIXHAWK 2 CAM_TRIGG_DIST with Flir ( PWM3 ), Nikon ( Seagull Map 2 ) and GoPro ( Pico Switch ) separately but I’d like to trig them simultaneously.

Problem: When using Gimbal for fixing shutter pushed and not pushed values on a second servo, same values are written on first servo and first servo is disabled.

Can you help?