A family photo archive
A family archive Chest is one shared set of original files, not a camera roll and not a chat.
A camera roll mixes the photos you meant to keep with screenshots and everything else. A chat buries them in the thread. A Chest is the set you chose to share with the people you invited.
The first release does not add folders or face recognition. The Chest is one shared place. You invite people into that place, and they join with a display name. There is no password.
Storage follows the plan on the account. The app shows the current price from the server. Guests are not a pricing tier.