Default Remote share feature

I am not sure if this is something entirely new but the X2 tablet has a feature to mount remote shares (windows and sftp) directly via the Sony firmware. It's located at the bottom of the storage settings.
Seems like a nice thing but I can't get it to work, the Host field doesn't let me enter anything useful (no slashes and no dots)...
Does anyone know how to get this to work?

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