What is a hidden memory?

As a journal owner, it is possible to “hide” photos or videos during the initial upload. This keeps the moment visible only to you and to those followers who have been granted Full Access permissions (which makes them a co-owner of the journal with you). To those without Full Access, it would remain hidden.

It’s important to note that it is not possible to retroactively hide or un-hide a moment once it’s been posted. The decision has to be made during upload.