"Move" tool not working to small layer
I opened a two-layer XCF file, then opened a small PNG file as a separate layer. I've been able to rotate it, draw a rectangular path around it, selected the area from the path, but I can't move the PNG. It stays dead center. It's not locked.
I've posted this in discuss.pixls.us but I sense they are mostly interested in photography. In gimp.org, it's about code. I've done a Google search looking for a GIMP mentor using Zoom. So far, zero results.
UPDATE REQUEST: The one thing missing from the gimp.org website is HOW TO GET HELP. I use Zoom to help others with all kinds of things on a regular basis, would appreciate someone checking this out to see if the problem is in GIMP or it's me.