Epiware:

You can upload documents by navigating into the library section in the tabs.
Replacing or editing a document can be done by right clicking the document and selecting edit/replace.
To its previous version revision history, right click the document and select version/history
You can keep track of multiple document projects. This is done by the root user when he adds a new folders and give read/write access to the corresponding users.
There is also a forum that can be utilized to discuss any issues dealing with the current project in hand.