Hi Klaus,
I am using DSM 7 with my Melco.
In File Station, I have created a Remote Folder mount under “Network shares”.
File protocol: cifs
Folder: \my-melco-ip\share
Mount to: /volume1/Network shares/Melco
In the Roon Docker container configuration under “Volume Settings”, I have added a Folder
File/Folder: /Network shares/Melco
Mount path: /music
Hope that helps,
Mark