I'm attempting to merge these two meshes together. They are already right beside each other in the way that I want to merge them.
The top mesh, highlighted in orange, and the bottom mesh, which is a flattened cube that I've curved using a path (the black line on the right)
I'm trying to follow this question and answer to join the two meshes but I can't get past the first step of selecting both of them at one time - is this because of the curve?
P.S. Here's the .blend