Thread:Triggerology/@comment-22439-20130804200720/@comment-6532078-20130804203735

Probably because it has wrong MIME type, since you had the picture saved in .jpg. You can manually convert it in any graphic program or the good place is, for example, here. But as I've just said before, we already have the picture you're trying to upload - File:Volume 8 Full.png, so we don't need another one.