BuddyPress Activity Plus file formats.

how can i change the settings for this plugin?

according to the instructions if i go to settings > media there should be something, there isnt.

when i tried to add a pdf to the site it wouldnt allow it, so i need to know how i can add support for pdf, doc, docx, ppt etc.

my site is private group and we need to be able to share documents with each other.