This does not tell me how you want to access the files, only that you do.
Whatever way possible? I guess I'm confused by the question. Currently if I open THIS PC > NETWORK > OMVnas I can see all of my shared folders/files. I want to be able to do something similar to that. I only followed the guide that I linked above because it came up when I googled "how to remote access OMV". If there is another way that is easy and doesn't require OpenVPN then that's fine too.