I discovered an issue earlier today when featuring thread with images as attachments.
@Brogan has mentioned this in the FAQ but I thought I'd explain in a little more detail and give a solution for anyone else who encounters this.
Here is a thread with an image attachment in it:
When Featured (note I added some blank lines in the Featured Thread text so that the image would sit nicely below the icon on the Featured Threads page and it didn't appear in the Featured Thread block on the forums page), it appears like this:
As you can see, the attached image isn't displayed, instead a link to the image is shown.
This isn't a problem with the Featured Threads add-on, this is a technical limitation with the Xenforo software - you can't display attachments from one post in another post using the ATTACH BB Code.
The solution
Open the attachment in a new tab (by right clicking on the image in the post itself) and copy the URL.
In the Featured Threads overlay, replace the ATTACH BB Code with the IMG BB Code and paste the URL in.
So you would go from this:
Code:
Here's a post with an image attachment.
[ATTACH=full]650[/ATTACH]
to this:
Code:
Here's a post with an image attachment.
[IMG]http://www.yoursite.com/attachments/warframe_20140505161651-jpg.650/[/IMG]
The result is what is desired: