
I don't have a fully-fledged NAS myself, but my router (Linksys x3000) simulates one when a USB hard drive is attached to it. It shows up like a NAS on pretty much every gadget.
To mount it on a Joggler for Logitech Media Server to find I fill out the following in the webserver:
IP Address: I just put in 192.168.0.1 (the IP of the router)
Shared folder: Music (no / \ or anything else. Music is the simple name of the share which I have configured in the router settings. I presume it is case sensitive.)
Username: joggler (I set up a user in the router settings)
Password: joggler
Mountpoint: media folder 1 (or whichever number you choose. I have set up each joggler in the house to work with a different folder. Don't know if that improves things/prevents/causes problems, but it works for me.)
I then click 'Add Data' to set it up.
I then access it in LMS -> Settings -> Basic Settings -> /media/media/media-share1 (as long as the media-share number matches the folder number set as the mountpoint). I wonder if the problem is not pointing it to media-share1 in the /media/media folder (or 2, 3 etc depending on which media folder is configured).
Hope this helps solve your problem!