Swiss, I checked and although I am not a computer geek I believe that it is not possible to do this on FT. Certainly for reasons of server capacity and bandwidth. You need an outside service.
If you don't have one, you can send me a pic or two. I'll shoot you a PM with my private email. I can then post the pictures with your explicit copyright added. On your request I will delete them from my flickr account, which will then automatically delete them on FT (broken link).
Just for kicks I post one here from the "Museum Hill" in San Francisco. Slightly OT.

Copyright tfar
Till