Pinch with Thumb and 3 Fingers to save

Hi

I have been a longtime user of a Fingerworks iGesture pad and I am trying to recreate my gestures.

Pinch with Thumb and 3 Fingers was the gesture to save a document. It trigger the keyboard shortcut of command+s.

I have programmed that in BTT and it is not working. Any help would be appreciated!

Thanks in advance!