How to add UNC path with credentials (like Fritz.nas share) in Plex App to Libary

Hi,
i installed Plex App on my WD MyCloud Mirror.
Adding a folder to a libary what is locaded on the MyCloud is easy. But i tried to add a folder what is shared on a Buffalo Station which is connected as NAS at a AVM Fritz.Box.
On Windows i type the unc path \IP-Adress\share and then the username and password in the popup to connect to the share but how can i add this share on Plex with the credentials?
can someone help me please?

thanks
Vanessa

Hello there,

I have no tried this, lets see if another user can share some information or tips on this matter.