My NAS shows me no content

I’m from Germany and first of all thank you for this great system for my Pi. The Soundquality is awesome.
But a problem occurred.
I’ve mounted my NAS by SSH and I see it in the Web Ui. When I open a folder with my music, it shows no file or anything else.
I don’t know why it displays nothing.
I have a Synology NAS DS 112. Can anybody help me?

edit: Does nobody know something?