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Thanks for the reply and question.
SoundTouch does not work with Plex; it works with NAS drives that have DLNA capabilities. The WD NAS My Cloud Personal Cloud Storage is a NAS drive other SoundTouch users have had good experiences with.
Joel - Community Support
As Jason mentioned above SoundTouch products may or may not work correctly with Plex. Most often we see some partial or incomplete functionality since these both use Elements of DLNA however this may change across different combinations of hardware and software. The SoundTouch systems are not fully DLNA compliant, and thus they are ultimately not compatible with Plex.
We apologize that this will not match the way you were hoping to use your product.