There are various file managers, file uploaders out there. We use the
http://www.responsivefilemanager.com/#s ... 35ihG.dpbs
responsive file manager which can then also handle the uploading, selecting a file already on the server, image editing etc.
At the moment, to add a picture you have to keep uploading it each time you want to use it, and you can only add pictures.
A filemanager plugin option would allow us to send any files to people in a chat room or private.
We will add the feature ourselves for the moment, but of course it will get overwritten in the update!