A Type icon appears to the left of the title of each attachment to help users know at a glance what type of content to expect before opening an attachment. It is possible to configure content to manage which type of attachment is available.
Example
When redirecting users to a PNG image available on a different web page, it can be helpful to display the PNG icon and an arrow in the Reader page. To do so, add the filename with the .png extension in the href attribute as follows:
<topicref navtitle="My little pufferfish" href="pufferfish.png" type="ft:attachment" processing-role="resource-only">
<topicmeta>
<othermeta name="ft:url" content="https://www.pufferfish.com/B91tozyQs9Mx.png"/>
</topicmeta>
</topicref>
This prompts Fluid Topics to display icons showing users that the My little pufferfish map attachment is both an external link and a PNG image.