My Stream Deck+ does not work with a Long Press. Performing a long press does not result in anything occurring. The option "Cancel Button Up Action..." does not prevent the Up Action from occurring after a long press (which, of course, makes sense if the problem is that the long press isn't recognized by BTT.) The same button works as expected on a Stream Deck XL. I am using the trigger "Stream Deck Button."
Mac Studio, M2 Ultra
macOS 15.2
BetterTouchTool 4.993
Stream Deck+