The cloud drive solution is a distributed file system. This means that the files are always local files, and not connected directly to the server.
This enables users to work offline, and synchronize to the server when they get online Again. Even in online mode, the system operates this way.
If more than one person is working on a Revit file (.rvt), then the problem arises when more than one person is updating the files at the same time.
Basically, it is a last in first out system, so it's the last save that "wins", this means that the other changes go into history and the users have to figure out how to incorporate the changes into one file.
In Revit, there is a feature called "Work Sharing". This enables the Revit project to be divided into sections. Eg.: for a house, the roof in section1, the first floor in section 2, the cellar in section 3, and all the plumbing in section 4.
It's possible to have different users working on the same drawing, but different parts of it.
This would be the correct way of collaborating in Revit.
This is just a small explanation on how to use it. Please refer to the Revit manual to get all the details including do's and don'ts.
(This feature is tested with the cloud solution and Revit 2015)