Hello,
I am sorry, I have to get back to this issue.
In fact I never really made it work reliably.
Following the steps depicted in No access to network files (Synology DS213j) - new user, I found that I always need two attempts to mount my SMB share.
Upon the first mount command I get this result:
mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
Then I just submit the command immediately again and the share mounts correctly.
On the other hand, simply booting Musicbox twice in a row did not help.
After getting the error message above after the first boot sequence, I rebootet Musicbox, startet my terminal session again and executed the mount command again, yielding no error.
Then another reboot of Musicbox made it correctly load the shared music folders.
Can someone provide help in this?