I once found myself explaining the details of "Copy" as something like "like making a ghost clone of the original that you are holding and can put it down to make it a real clone if you want to, or just let go of and it disappears"... so yeah, that function didn't get properly made graphical at all. Way too much hidden behavior. The command line, because it makes you specify where the copy goes, is far more clear. If there were a little icon of the file that attached itself to the mouse pointer in between the "copy" and "paste" steps, that might clear things up nicely.