I wanted to use a cover image for experimenting with an Instant App, in the configure section, I select the "Image" button, then I hit the "Choose file" button and select my image. From the screenshot you can see it's uploaded, but it doesn't appear on the screen, just a gray color is in the background. It doesn't matter if I Publish, then launch, it's just a white background and not the image. I'm not sure what I'm doing wrong.
Thanks,
Mary