Are you asking me to do your testing? Before most clients had image upload features, we just pasted in the URL. There was no way to know how the image would display in the post. Some users added a space, others added a line break. It was trial and error. But most clients have figured out the best way to do this so the post displays consistently on as many clients as possible. When I post an image without using the uploader, I simply add a single space before the URL. Every client understands how to display this except apparently Amethyst.