We have a large ad and it show up when we place the url inside the image option but when I post it, it has a icon of a image with a X over it. Do I need to adjust a setting so we can get a 12K length image?
That's the image proxy not allowing the image to be proxied, very likely based on the file size of it. This is configurable in the options ("Image Cache Max Size (Kilobytes)").