Thanks for your assistance thus far.
Why not just pre-compose both layers, and apply the corner pin to the pre-comp?
– Have tried this, but unfortunately this results in the main image losing quality. Additional to that one could never corner pin so accurately to exactly snap into the real image..
Reading your other post – Or are you trying to “zoom in” to the tablet image, and get the background image to react to the corner pins of the comped image extending out to the full screen?
– Correct.