Видео are uploaded as Ссылки if Fanpop doesn't support embedding from that site. So, for example, Fanpop supports embedding from Youtube, so Youtube Видео are uploaded in the "Videos" section of a spot. Fanpop doesn't support embedding from Megavideo, though, so any Megavideo video Ты try to Загрузить to Fanpop will automatically be Опубликовано as a link.
As for the images, I'm not sure. What may have happened is that the Обои Ты tried to Загрузить was too small (the pixel size was too small) to be considered a wallpaper, so it was automatically uploaded as a photo. I think the same thing happens if Ты try to Загрузить a very small picture (e.g. 100x100) - it gets automatically Опубликовано as an icon. I'm not 100% sure of this though, so someone correct me if I'm wrong.
ETA: So I just checked - when Ты go to Загрузить an image, there's a handy little info box on the side of the screen. There, it says,
"Any Обои uploads smaller than 800x600 will be re-categorized as photos, and any Обои 200x200 and smaller will be automatically re-categorized as icons."