How do I put in a background image

I've been trying to include a background image into my game, but it doesn't seem to be working. In the Game Details page, I paste the image URL into the input box that says "Background Image", but nothing happens. What am I doing wrong?

Have you tried with a different image, just to see if there is a problem with the one you are using?

What URL are you pasting into the box? If you send me the game id (or a link to the Game Details page) I could take a look.

I've had trouble uploading a background image, too. Tried jpg, gif, different sizes.

I upload my pics to Imgur, then use the direct link code, which is a PNG file, and paste that into the box.

So it looks like something like this:

https://i.imgur.com/Yourimage.png

Yep, that's what I do too, but no joy. It's worked before, but not recently.
edit: And now all of a sudden it works again. Bizarre, but welcome!