It still opens my whole public photo stream to view in the post rather than just the one image.
I had to remove a whole lot of extra redundant text in the embed string so that it just showed the image between the [MEDIA] tags. The alternative was this.
<a data-flickr-embed="true" href="
Template public:_media_site_embed_flickr not found. Try rebuilding or reinstalling the s9e/MediaSites add-on.
For future reference in this thread for all dumbasses like me.
I had to edit the embed code provided by Flickr and only use the section with the image source and dimensions. I cut and pasted that section into the link image box.