bizmodeller

I found some old iTunes info (from 2013?) in this forum, and it mentioned to go to the Settings -> Network to create a drive mapping (I have my iTunes music on a QNAP NAS) but I don't see this anywhere.

Is this feature only available for Windows?

I've tried editing the .xml file even using relative paths:
/share/CACHEDEV1_DATA/Multimedia/foldername

To no avail.

Thanks!