I am able to successfully add HTML/XML formatted PVA response from flow to user/bot chat feed. However, when I try to include images I cannot get the image to load (they are represented in chat feed message as "Loading image...".

I rewrote image @src to full paths in response to PVA. The images are stored in Team's library. I even tried adding a closing tag to element (saw something about the need for xml formatting, but wasn't clear this was where that was required).
Is there a trick to getting images to load properly?