I'v installed this great plugin "BuddyPress Docs". But it only lets us create a new doc like a new2 POST. Why doesn't it lets us upload an existing document (word, excel, PDF etc.) from our PCs? We work on our PCs on an excel sheet then upload it to be shared among other group members for viewing or further editing. Does this plugin support this feature? or is there any other plugin for this feature.?