The file was inside the “gallery” folder as “main” – even though “m” is supposed to be capitalized. And, yes, the gallery was in the selection box for import photos. I selected “main” and executed. It seemed to finish what it was doing, but there were no images and when I went to look for “main” or “Main” again, it was gone.
As a programmer in another life, I can appreciate bugs, but I’m not certain it is a bug and not something I did inadvertently, although I have no idea how that could have happened. But, when I went thru the cpanel and looked at the file structure, it was definitely gone.
I have a bunch of plugins and I suppose one of them could have interfered and corrupted something. I’m sorry if I can’t be of more help. If no one else has reported this problem, perhaps it is unique to what I was doing and other users should not be concerned.