Hidden Photo Vault

A hidden photo "vault" would be a great addition to the feature set. I have my entirely library shared with my partner but would like to be able to create a "vault" or album that allows photos and videos added to it to be hidden from any share outside of the creating user. 

A lot of reasons this would be handy but one such reason would be hiding photos of pictures taken for gift ideas, or screenshots taken of a product page as a reminder to go back and look at it. These don't need to be in the general photo collection but get uploaded by default when allowing monument access to upload all photos.