I bought the hub to match the Arlo Ultra 2 cam connects simply with a one button pad approach and also easy to connect to house fibre wifi. I bought a 2TB external HDD too but the hub seems unable to format this for use on the Ultra system maybe it's the same with all external HDD so resorted to a 128GB USB thumb drive and that worked fine. All motion detected videos stored locally to the USB drive and able to access the videos (MP4 format)via smart phone Arlo app or web login.

Good to be able to get hub without additional camera's so could utilise some now unused cameras at a different site. Set up is simple and all working well, with 2 sites operating fine on the arlo app.