Quick resume does work off external. Also this list has quadrupled in the last couple of weeks. Doesn’t show which games will allow the upgrades off external though: https://www.xbox.com/en-US/games/xbox-one/xbox-one-x-enhanced-list#tabletitle
Thanks for the heads up OP!! Online shows CoD out of stock in my area. Called the store and they have plenty so I'll be picking that up along with an adjustment for DR 3 and BF 4.