I am trying to add my company logo as a watermark to an image. As I understand it, the syntax is
watermark="image=mdclogo.jpg"<SPAN class="line-numbers-rows"><SPAN></SPAN></SPAN>
When I do this, all that appears on my image is the text after "watermark=" and not the actual logo:

This occurs in two different surveys. It also happened in a survey I created using the samples. I tried both PNG and JPG with the same results.
Am I missing something or doing something wrong? Thanks.