Hi punkncat & thank you for your thoughts on the subject,
As I understand it, one of the cool things about Plex Server is that you can store your own library of videos and have it available to all devices that share the same network as the Plex Server.
In our case, it would be a shared library for every device that has the Plex App (TV, phone & tablet).
In addition to being able to share your own library (in a very organized Netflix-like format), you can also view programming (movies, tv shows, etc) that Plex offers. Is this the material you are speaking of when you say "online"?
I'm still learning and searching, so any thoughts on this subject are very welcome. Our library of movies and programs has several hundred files (many of which are hard to find), plus subtitles when needed. Ideally for us, a media server would allow us to choose the network we would like to display the materials on and in a format that is easy to navigate. Plex Media Server appears to be able to resolve the latter, but the question is how to resolve the former.