Open an album in Left panel - select some pictures - drag and drop them to another album in the left panel

everything works

but the fist icon seems to be fairly large and round so it is hard to be sure you dropped  the images in the right album

Suggestions:

Display the name of the destination folder in the header of the popup window (Move here, Copy here, set as thumb..)
or
Instead of 'Move(Copy) Here' display ' Move/Copy to "destination folder" '
or
There is no need to show the full path e.g. '/pictures/2017/folder1' just the folder name e.g. 'folder1' would be sufficient enough.
Change the fist icon to an arrow or something like that (not sure if this is set by the system properties though)