In the Cascade Story Map Builder, I attempted to add image via the "Link to Content", like so: https://www.bothellwa.gov/ImageRepository/Document?documentID=8024. This was the result:

It seems that the Cascade Builder only recognizes image URLs with file extensions, because I tried a URL with .jpg and .png, those both displayed correctly. Does anyone know if there is a workaround to get image URLs to work without the file extension visible in the URL? Thanks for any help you can provide!
Andy