Hello! I am trying to create my own theme using Firefox Color, but the custom image I uploaded doesn't show in the actual theme, only the little preview. It is definitely small enough, so I do not know what the problem is. Is this able to be remedied? I am adding a screenshot so you can best understand what I mean. I have not used FireFox Color before, so if it is an obvious fix, I apologize for the trouble. Thank you, have a great day!