no acces to NAS smp/cif error


first of all I have to say I am new here, new to all of this and a windows user but so far I tried my best to get a connection to my nas but it always getting the same error message “Retrying with upper case share name mount error(6): No such device or address Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)”
I followed the guide from Lag-na without any solution for my problem. If I´m using the command from the guide “ro,noatime,sec=ntlmv2” I´ll get a different massage " Last system mount error
mount error(22): Invalid argument Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)"
My NAS is a qnap ts 409 with smb enabled and I have acces over my PC, Dune media player and Android devices so I think thats not the problem.
I have 4 hard drives inside and on one of them is a music folder with seperate folders inside like Flac, mp3 ect. This is the way it looks right now
( … kgvgbz.png)

I really don´t know what to do.