FTP transfer software just uses the same, already familar Microsoft Windows tools of dragging, copying, pasting, creating, deleting, renaming, etc...(click-click! Shift or Ctrl)
The directory "tree" is same as you PC's layout, as it appears on-screen with directories,and subdirectory. One on left, One on right.....slide things back and fourth to transfer.
It's that easy. You can delete a case you sent by mistake, or rename a shade of something in-que, you can see when someone grabs your files and moves them.
No need to call and ask if someone received your file, because you can see it on the server the FTP software is connected to.