When I go to submit files, the only thing I am allowed to upload is an image. I have a full mockup for each of my apps, as well as a .pdf presentation highlighting the important cause my app is centered around. Where do I upload files that are other than an image?

To quote one of the updates;
"Your submission can include a description, pictures, videos or other files. The app concepts will be voted on by the public, and submitted to the judges for review."

Hence why I am confused.