There is currently a warning dialog for multiuser sessions that says:
The document may not load. Changes may not save.
Multiuser sessions are public. There is no security.
I don't know how well people can understand this in general, but certainly if you're coming to the app via a link to a multiuser session, the dialog doesn't make clear that it is a special case that you're entering a multiuser session (or even necessarily that you are, I suppose!) and that these warnings refer to that.
And importantly, it doesn't let you know how to get out of a multiuser session you're entering.
Here's a draft of what a more useful dialog might look like (altho it's much more verbose):
You're entering a multi-user session.
Multi-user sessions are public. There's no way to create a private multi-user session.
Also, there are no guarantees that the document will save or load.
If you want a private (local/personal) session, do blah blah blah.
There is currently a warning dialog for multiuser sessions that says:
I don't know how well people can understand this in general, but certainly if you're coming to the app via a link to a multiuser session, the dialog doesn't make clear that it is a special case that you're entering a multiuser session (or even necessarily that you are, I suppose!) and that these warnings refer to that. And importantly, it doesn't let you know how to get out of a multiuser session you're entering.
Here's a draft of what a more useful dialog might look like (altho it's much more verbose):