Hello @Barrie_Hadfield,
We have previously seen some strange behavior with auto-mounting via the OS instead of directly from within Roon. Can you please let me know what your experience is like if you try to edit the storage location and point it directly to the share? Ex. smb://10.0.1.30/music as the Network Share Location and also adding the same credentials you use to log in to it. Does deleting work as expected then?
Thanks,
Noris