I uploaded a zip file into the "root" area. However, I am unable to move it into any folder. When I drag the file on top of a folder, it jumps back. I am using Firefox on a Mac (OS X) with a mac mouse, so I don't have the "right click" "left click" options. "Copy" and "paste" options do not show up under the file, allowing me to move it to a destination folder as outlined in the FAQ. Please help.