If your NAS runs DSM 7 then connecting to network shares in Roon does no longer work. Why you even try to network mount a local folder - IDK but sounds silly to me (unless it’s the last possible option like for some QNAP users that are currently affected by a bug that prevents to use better options reliably or at all).
I don’t have DSM at all. I was referring to other posts from users and even the maintainer of the RoonServer package who tell that software in packages in DSM 7 are no longer allowed to mount shares - but maybe you don’t use the package at all? Maybe that is also why you have to use the share to access a local folder? Maybe using 127.0.0.1 works differently than using the external IP-Address have you tried?
My apologies to you. It seems you are quite correct about not being able to mount SMB shares any more.
I just realized that the “Add Folder” option was not an SMB share (I thought it was) and the only reason it had stopped working was because of file permissions (which I had fixed as part of removing user authentication) and so I thought I was in fact mounting a share.
A user gets created for each individual software package installed under DSM 7. Adding the individual user for the RoonServer package to your library folder and giving him sufficient rights might do and is possibly better than removing rights (or give rights to everyone). Read more about it in this post: