Image attachment for project page not working

Hi,

I've tried attaching an image to my latest project but it is not showing: http://drupal.org/project/adt_basetheme
The first image I tried adding was perhaps a bit large, but I've also tried adding a standard sizes screenshot.png and it failed as well.

Furthermore, it would also be cool if I could add some more images to my project page and float them left and right, but the input filter does not allow me (to even add images).

Thx for your time!
JR