Wallpaper won't show in Rhino 7 viewport

Tried adding a Wallpaper image to a viewport in Rhino 7. It won’t show. This seems to be a new problem because I was successfully Wallpaper in Rhino 7 a phew weeks ago.

It’s working fine here.
Have you tried different image files?

Please run the Rhino SystemInfo command and post the results.
This will tell us what resources Rhino is using on your computer.

Thank you for your reply. I did try other images, which I thought were JPGs. Turns out they were HEIC files from an iPhone. After converting them to JPGs they worked as expected.