Well, first of all I don't think that's what the plugin is intended for. I believe the idea is that it will store uploaded media at a cloud provider instead of the local server and will use their CDN to deliver it.
However, looking at the code it doesn't really do much. The upload mechanism is missing. All it does is simply to redirect access to media files to the configured cloud url. It provides no way to actually ensure the media is over there. It also does not provide any mechanism to check ACLs.
Even the documentation page is unfinished. I'm tempted to just delete the plugin page.