Samsung Galaxy Tab S 8.4 (SM-T700) support for OTG (On-The-Go)
Finally found a USB OTG cable at Best Buy.  Samsung branded as a "Host" cable but nobody knew how it works (or even they had it - 'OTG' that is).  Tried to convince me I need to swap SD cards to transfer pictures from camera to tablet.

Not buying this, I bought the Samsung "Host" adapter cable on the assurance I could return it if it didn't work.  It did.  Worked great.  Just plug in the cable to both the camera and tablet and power up the camera.  And there is, identified as usb a.  Was able to view and transfer (copy) pictures and videos from the camera to the tablet.  No separate file manager app needed either.