Not working properly with my Galaxy Note 8. The button only works as zoom in.
The package instructions suggest resetting all your connections (wifi and Bluetooth) but I still have the same problem.
I also checked their list of compatible devices and the Galaxy Note 8 is in the list.
Update: the Shuttergrip button can be re-assign by goin into settings in the camera app, then volume key functions, then re-assign to take pictures, video, zoom, or volume.