Why does Bridge return "...does not contain supported media"

Howdy,

I am using a Nikon D3200, on an iMac using macOS Sierra 10.12.6. When I first try using Get photos from camera, I get the Photo Downloader dialog box that reads "This device does not contain any supported media."  If I use the refresh list from the GET PHOTOS dropdown, the pictures are loaded into the Photo Downloader.

The File > Import from device appears to be working as designed.

This all seems kinky to me, as in why won't Get photos from camera work without refreshing the list, but import seems to work fine.  Does import do a less complete job of downloading the files than does Get photos from camera?

(BTW I deleted the cache folder, but this had no effect. )

Also, I have checked the When a Camera is Connected, Launch Adobe Photo Downloader option in preferences.  This only works if Bridge is already running. I had expected that it would  launch Bridge and Downloader in a manner similar to the Apple Photos App when the camera is connected.