Kudos to Russ who reached out to me and was kind enough to walk me through the setup during our phone call.

Thanks to his effort (and everyone else's input) Roon is able to access the content of my MC200.

As posited- it was my user error that caused the problem. I was unaware that one had to "add" the MC200 to the watched folder in the Roon app.

Since Roon automatically detected my iTunes library when I first installed it, I wrongly inferred that roon would automatically find the path to my MC200 once I mounted it.

Russ is a true gent and an asset to the HH community. Many thanks to the admins and other helpful HH's as well.

MC200, Aqua La Scala DAC, Conrad Johnson CT5 pre/LP70S amp, Verity Audio Parsifal Ovation speakers.
Shunyata Hydra power conditioner, Asst. Shunyata, Nordost, & Siltech cables.