<p>See our <a href="https://www.bt.com/help/broadband/bt-cloud/getting-set-up/download-or-access-files/how-do-i-download-files--folders-and-devices-from-bt-cloud-">help page</a> for further information.</p>
No - just plug in the cable, and if it sees your hub as reachable on it, it'll switch over to using LAN. You can confirm that it's using Ethernet via hub manager.