Files locked on my NAS

[simoncn]

MinimServer does not put a lock on the music library directory. This is a permissions problem with the shared folder that contains the music directory

How are you copying files to the directory? If you are using Windows Explorer or Mac Finder to access the library as a shared drive, you might be sharing the drive from your Windows or Mac machine using a username that has read-only access to the shared folder (for example, the default "guest" user).