I have found on 2.1.0 that if you Map a drive to another PC and use this it works. BUT when you enable Security it breaks. Get to login screen then just 'page not found'. Checked by removing security and page displayed fine.
If you 'edit' the Jason and add Network share Ubooquity does not start up. This is either a link to a share, or a full UNC path to the folder. May work if no security, but useless if publishing to the outside world.
BTW using Windows 2012 as host.
Customer support service by UserEcho