First - you do not need to worry about the temporary URL. It's a bit of a misnomer since the "temporary" url will not change.
I looked at your files, and I did not see any folders in the public_ftp folder (other than "incoming" - which is okay).
FYI - you can view this newly written article on adding media to Wordpress 3.5.1
. I wrote it because we lacked some instructions on this issue in our Wordpress tutorials. If you review it, you can see that you did not have to make the directory outside of the Wordpress administrator dashboard. Also, if you changed it this way, then the URL link will be updated when update your WordPress configuration entries.
Hope that provides some further info! Thanks again for your patience!