I have had the same issue but I solved it on my comp..I only been using it for a few weeks so It may have been just luck.
I got 8 comps all titled sheets 1 to 8
I used Alt + Drag to drag a pic on to the solid layer in sheet 3 which worked..but it wouldn’t work in the other sheets..it just kept wanting to place it above the solid.
so I just clicked on the solid then held Alt and left clicked on my picture and then it let me replace my solid
hope that helps