[@netweb Keymaster 12 years, 4 months ago]

I’d like to support attachments in a future version but at this stage it is not supported.

@cybmeta Has written a Joomla Kunena Forum Attachments converter for the GD bbPressAttachments plugin.

You might be able to adapt that to grab your attached images with a couple of tweaks:

https://github.com/CybMeta/kunena-attachments-to-bbpress

Kunena converter for bbPress 2.4

Kunena converter for bbPress 2.4