Sync media from PC to Plex Server on Nvidia Shield Android TV

I have a Windows 10 PC where I download, edit, and generally keep all of my media (photos, music, videos, tv shows, movies, etc.). I could run Plex Media Server on this PC, but why when I've got an efficient Android device that is always on and could do it just as well, or better?
I have an Nvidia Shield Android TV device with Plex Media Server connected to my living room TV. The issue is getting all my media onto the Shield, and then syncing any subsequent changes. I found the best method is to use a PowerShell script referencing Robocopy. However, there are some key points I've noticed in my experience that I'd like to share.

Putting your Ubuntu Linux Steam library outside the home directory

I use Ubuntu. My "../home" directory is mounted on a separate disk. The advantage of this is that my data can be accessed independently of my applications and operating system, which is a performance boost under some tasks. By default, Steam puts its library in your "../home" directory under ".steam." That is fine for most people, but not for my use case. The solution is to create a new directory under "/opt." I called mine "/opt/steamlibrary." The important part is establishing proper read/write permissions. First, you'll need gksu to make it a little easier. Open a terminal.

sudo apt-get install gksu

gksu nautilus

This opens a nautilus window with root privileges. Go to "/opt." Create a new folder and call it "steamlibrary." Open the folder properties and make sure that your personal user has full read/write permissions.

Now, in Steam, go under "settings," then "downloads," then click "steam library folders" and add your new "/opt/steamlibrary." The next time you download a game, make sure you specify this new directory.