I’ve been trying to rule out if post attachments aren’t implemented or if I’m having a real issue. When selecting the “Upload attachment” tab, I simply see “If you wish to attach one or more files enter the details below.” and a “Add files” button that doesn’t seem to respond when clicked.
plupload.full.min.js, plupload.js seemed to be downloaded when inspecting with Chrome’s dev tools. I can also see phpbb.plupload js in the body when viewing source.
On the other hand… I love this theme!