Can't add panels

Sorry! I'm new to Twitch.

I'm trying to add panels, and when I don't include images, it goes perfectly fine. Instantly uploads. But whenever I do try adding an image, it'll just load forever and I can't figure out why.

I doubt it's the image itself, because I got it customed made for Twitch. But I also can't figure out what other reason it could possibly be. I tried Chrome and Microsoft Edge, but both led to the same failure.