i didn’t put the IP of shield adress in right and once I got that proper one from the shield and had the hard drive hooked up to it I entered that into the Mac search and then I was able to finally add the storage from the hard drive directory (could see it now) when I went to the library of the movie section then it added itFor any others that may come here with a similar problem: What was the fix??
I think it was overly complicated because I started backwards by putting (and then removing) the plex server on the Mac when I shouldn’t only put it on the shield. So many extra driectories to navigate with both and not speaking to one another. This is why I could play from the plex on Mac or shield when hard drive was on Mac but I really wanted to play from shield with hard drive on shield