Vanishing Point: Can't paste artwork into blue grid
I found a number of threads in this forum by people with this issue, but none of the solutions have helped me at all. So here I am, asking the same question. At least I brought pictures.
First, the technical stuff: I'm using (an up-to-date) Photoshop CC 2018. I'm on 64-bit Windows via a Dell Core i5 @ 2.8Ghz w/32GB of RAM.
In this project, I am mocking up some new artwork onto one of our walls. Here is the image along with the blue-grid vanishing point buildout:

Here is the sequence of key-presses & clicks that I have taken.
- Before Vanishing Point: Copy the artwork to my clipboard
- Before Vanishing Point: Create a new, empty layer that I intend to paste the artwork into
- Now I formally enter vanishing point mode; the blue grid above is, by default, selected
- I CTRL-V to paste my artwork from the clipboard. Instead of pasting, I see this:

Big, fat nothing. After that nothing happens, the info panel at the top reads: "Click+drag in a plane to select an area on that plane. Alt+drag a selection to copy an area to a new destination. Ctrl+drag a selection to fill the area with the source image." Try as I click, I can't put anything there. I have tried a number of different types of artwork.
Due to the nature of this particular project, I can probably get away with just skewing the image, but am very irritated that I can't execute this technique properly since it appears so straightforward.
Any guidance would be much appreciated. Thank you.
