Help: Using AC56U with Sky Hub so that attached HDDs are still visible

With my Sky Broadband connection, I used to have a modem that made the internet connection and a Sky Hub that acted as a router. I replaced the Sky Hub with the AC56U and have been using it to serve external drives to my Shield for Plex. Now that I have Sky Q, the new Sky Hub replaces the router and modem as one unit which can't be replaced by my AC56U.

I want to have my AC56U connected to the Sky Hub in such a way that if my Shield connects to it wirelessly or my PC connects to it via...

Help: Using AC56U with Sky Hub so that attached HDDs are still visible