I finally got autofocus working when using the iPhone to control the camera via Smart Remote Control. The trick was to disable back-button focus (BBF) by setting Custom Settings (Gear symbol) 5 AF w/ shutter to On. I have to remember to set it back to Off when done using the iPhone to go back to BBF.
I shot some images as a test and found out they were all jpg after importing in Lightroom. In the Smart Remote menu on the camera, >2>Quality must be set to Raw & jpg.