I was just looking at the Photos app on High Sierra. When I go to a photo and scroll down, I can see thumbnails of the people's faces below the photo. I have not named anyone, yet. Below the people, I can see "Related Memories" and can click on them and they will show other photos related to the one I was looking at. However, when I click on the People tab, there is no information, and no way to add anything and when I click on the Memories tab it says that they will appear when more photos or videos are added. What am I doing wrong?