I recently made a comic, and tried to upload a page and a page avatar or whatever, and it won't update. Every time I open my comic it keeps saying it had no pages.

That usually happens if it's an unaccepted file type, or if the filesize is too big. Is it a jpg, gif, or what? And how big is it?

FYI a decent filesize for a full-size comic page (color) is between 150-250 kb (though the system will let you upload up to 2mb i think, huge filesizes piss off readers). DD will only accept jpg, gif, or png.