The HTML references the image as
<img title="Attachment Image: pastedImage.png" src="cid:pastedImage.png" arqual="'1'="000000000235702"" arentryid="000000000235702" arschema="AR System Email Attachments" arattid="18004" width="535" height="334">
so this refers to the AR System Email Attachments entry with entryId "000000000235702".
Despite the same HTML on the display-only form, the image is not displayed.
When I compare the image properties (when selecting the image inside the RFT field) from both I see these differences:
AR System Email Messages:
URL: http://<midtier server>/arsys/sharedresources/attachment/AR System Email Attachments/18004/000000000235702?server=<server>&?timestamp=1520438562036
On my Display-only form:
So I need to know what is setting the URL for the image on the AR System Email Messages form? What is replacing the HTML Content ID (CID) with the full URL?
I guess I can do this manually but it would be nice if AR Server or Mid-tier was able to do this automatically...