Image Back Plate Plugin question

Hi, …Anyone familiar with the Image backplate plugin?

I want to place a still photographic image in the background of a camera to do some automotive renders with HDRI lighting. The Image Plate method seems really good so far as all you do id drag the plate into the scene and group it under a Camera Actor to make it the parent. After this the plate is fixed and you can have whatever distance between the camera and the plate as it resizes according to your camera settings. The problem is I can’t find a way to just map a still photographic image to the plate!? There are a few tutorials out there on how you can create an ‘Image plate sequence’ via the content browser…but this doesn’t work at all!? Any help much appreciated.