new setup across vlans/subnets

[Neo]

So, attempts to get volumio working across subnets is with a mount and the volumio appears to struggle at times requiring a factory reset.
I know it's possibly not the best place to ask, but folks here seem knowledgeable and have possibly faced similar issues.

Is it better to make a copy of the music directory and mount that to volumio? I ask because my first few hours attempting to set the NFS mount up removed visibility of that folder within the Synology (It was there in the Control Panel > Shared Folder, but vanished from Filestation. It did this many times with all my mount attempts until I reset the volumio and then it did not happen anymore) I just wonder ... as Minimserver is using the music directory, is there a conflict when mounting that directory to something else maybe?
Ideally I'd like to just have one directory with a read only mount for volumio, but don't want a conflict or problems with Minimserver. Would it be better to have a copy directory and then make them sync up during the night?

For volumio - playlists. I thought that they are stored locally on the volumio device? Not in the NAS?

I'm not at the point yet to start making playlists but don't want to encounter an issue further down the road when I think the setup is working nicely and then there is a permission problem or something like that.

Is there any write access that volumio might need to the NAS? Does anyone know a good universal playlist editer/maker/converter?