Hi @noblecron
To post a link, two things are required, maybe three.
1. The URL must end with the image extension such as ".jpg" or ".png". If there is no image extension, it will not work.
2. The URL must be placed within image tags. Type [ img ] without spaces. Next add your image URL. Then close the image tags with [ /img ] , without the spaces.
3. A final requirement is that the website that is serving the image allows the image to be served. Sometimes you will not know this unless you first try to add the image at website such as this one.