Course Banner

[Eric Christopher]

Hi all, my name is Eric,

I still new at openedX

I want to add the course banner (image above course, discussion, wiki, about tab)

I found the setting in advance setting, but when I change it (link to file contents tab, files&uploads), but nothing change

Is there any requirement for the banner itself?

or any tools that usually we use for that, because at some courses, I checked it using inspect element and there are 2 logos in their banner

and also they can change the css

Thank you