Never mind....
I found an older post with the reply that HR will NOT work with usb on an IPAD, only wifi (if your camera has wifi).
USB and wifi both work on android tablets.

Helicon Remote works great with my Nikon D800e and my iMac using the usb interface cable.
I attached my D800e usb cable to my Apple Lightning-to-Camera adapter, then to the iPad Air 2.

When turning on the camera, the iPad immediately goes to the Photo Import app, so I know it sees the camera.
When ...