I've mounted Forums at /forums, File-Storage at /file-storage and Attachments automatically gets installed at /attachments. But in order for Forums to present the 'Add an attachment' option, Attachments is supposed to be mounted underneath Forums.
I tried to mount another Attachments instance under forums, but Attachments is a singleton package. So then I unmounted it from the root and mounted it at /forums/attach. Now, Forums shows me the 'Add an attachment option', but it complains "Error: empty folder_id!". This seems to be a result of the fact that attachments_fs_root_folder_map is empty.
So, with this many errors, I'm thinking that I must be doing something wrong here. How do I setup Forums with Attachments?