QGC on HereLink V1.1 - shoulder button won't do "Trigger Camera"

I have been unable to configure the shoulder button (or any other button) on my HereLink 1.1 to perform the Trigger Camera function.

This function does work on the main flight screen using the camera widget.

I can’t tell if this is a QGC bug, or if I’ve simply done something wrong in the configuration.

Comments? Suggestions? Many Thanks!

This works:

This does not work: