As I uploaded a wallpaper, I made a mistake of choosing a 1920X1080 version to be downloaded by others, when I wanted to choose a 3200X1796 file. Somehow I messed up and chose the wrong file. When I attempted to correct it by edit, and uploaded the correct 3200X1796 file, when I later tested the download button, I got a error message. The preview, a 1920x1080 version works fine. I think I confused the system. 
I just tested it again, and it seems like the correct 3200x1796 version can be downloaded.
