Is it just up or can you not upload screenshots? Every time i click submit (before you get to the edit image page), i get an "form submission error".
This is an issue because Zenimax uses BMP, which is a huge file format. We're working on a solution to make it easier for users to upload them, which hopefully will be up soon. In the mean time you can convert and crop the image to PNG or JPEG and it should upload fine.