Xfinity Mobile Unlimited - video limited to 480p from personal NAS?

[DiscostewSM]

So I'm going to be going on a trip within a week, and I currently have the By-the-Gig plan with Xfinity Mobile which I was planning to switch over to Unlimited for at least a month mainly for this trip so that during my downtime, I can watch my movies and TV shows stored on my NAS at home using a Plex server (Lifetime subscribed). Now I understand that streaming quality under the Unlimited plan is limited to 480p, but is that mainly from places like Youtube, Netflix, etc, or is that overall including from my own personal NAS? They have the option to bump that up to 720p on phones (1080p with tablers), but that's HD Pass that is an additional $20 beyond the $45 pricing of Unlimited. If it makes any difference, I also utilize a VPN that my NAS connects to, and I can connect to it still with my phone remotely.