Originally Posted by Uchiha1412Toshi
If you make things in Paint, it may be getting saved as .bmp
When you're saving whatever you made, make sure to save it as .jpg If the problem is something else, then there may just be something wrong with either the site or your computer.
He's correct. This is why it's recommended that you install drawing/art
programs such as gimp, photoshop, opencanvas, ect.