Click on the red "FAQs" above and search for image. It shows to put an img-tag around the link.
I tried to provide a link to the screen shot I wanted to include in my question.
When I uploaded the photo to my box cloud drive and copied the URL and then Pasted the URL into the field provided when clicking on the picture icon in the message body options the box comes back in red saying its an invalid URL.
How exactly do I get a picture inserted into one of these messages?