[SOLVED] can see no files in libary

[Mann_mit_Hut]

Hello all,

i'm running moode on 2 Raspis (1x RPi 2 with LAN, 1x RPi 1B with WLAN) and i'm very satisfied with this excellent software.
The RPi 2 is connected with a USB HDD and all is fine. Libary is updated and the access to the HDD is without Problems.

Now I tried to get my MP3-Files from a NAS (USB HDD connected on my FritzBox) and the trouble began.
After updating the Libary I can see not any *.mp3 - file in the Folders of the NAS. All I see is a *.m3u (Playlist)...

Via ssh I can see the *.mp3 - files in the Folders of the NAS (when typing "ls  /mnt" and so on) but not in the libary 
       

The Libary is updated and regenerated.
Same problem on both RasPis!

Don't know whats to do...

thanks for reading!

greetings
Tom