I'm trying to set my Sony A7RIV to take still photos with my Ronin S.  Is there a way to use the Camera control button to autofocus and take stills?  When I try this the movie recording begins.  Seems simple, I see in the documentations "Stills and Video", but how?

You have to use the straight microUSB cable, not the right angled one.  I had this mistake.

Hi Graberphoto, if you would like to capture photos via the Camera Control Button, the MCC-Multi  cable is recommended, the MCC-C in the box doesn't support Capture photo, please check more details below.