It generates a unique URL for a content/image combination and requires an application data link to exist between them, as well, the viewing user must have read on the content object.
I tried in vain to get this to work. Neither OacsFs nor OacsAttach show up on my installation if I added them to the templating parameters and to make matters worse, the internal link and the upload picture link are reduced to a file not found error.
Could you provide a quick installation instruction here for this (acs-templating on HEAD).