images – Is this a banner art bug YouTube wont let saving publish?

So today I was trying to change my banner image from studio, it was my first time doing this so. I went and got my pic and used how many pixels and the MB. But when I finished I pressed publish and went off my mobile device, I am on mobile btw. When I came back I went to YouTube and went to my channel, the banner image wasn’t showing,(pls read this whole para)I went to YouTube studio and tried to reupload a few times and pressed refresh after I pressed publish but it said “Discard saves. Cancel or refresh” and that kind of stuff. I have tried searching up some help but it didn’t work. I have tried some techniques that failed such as, make the file size 2MB, Crop the image, etc. Can someone help me with this