Shared User access and Ring non-info

I want my partner to be a Shared User - easy, apparently! However, Ring do not say whether she will have to download the Ring app or not! I will be receiving my Video Doorbell 3 today, so I can’t actually do anything until it arrives.I have received my Chime (just one, but our house could do with two!), and I have charged up my spare Quick-Release battery pack. Again, Ring do not say whether the battery pack which will (I hope!) come with the doorbell is already charged or not, but at least I have one battery pack charged and ready to go!