Click on thumbnail to enter ::GALLERY:: or see image.jpg click "edit root gallery" (upper left) to get to edit page. On left will be a 'tree' view of galleries. Blue folders have subgalleries. Click blue folder to show subgalleries. Hightlight gallery that you want picture to load up into. If you get in wrong gallery in content view you can drag image into correct gallery. You can also copy image into another gallery so it will be in more than one gallery.