One of the many collection tasks in Infinity Nikki is its photo journal, also called "expeditions." After getting Momo's camera and snapping a few photos, you'll get a message in the Friends app of your Pear-Pal from the LuminaLens Touring Photographers introducing you to the expeditions menu.
By photographing landmarks in the journal, Nikki will get materials to upgrade her camera with new lighting settings, poses, and other features. But it's very easy to accidentally not get credit for all the pics you've taken. Here's how to make sure you're always logging your photo journal progress and how to check in on which photos you still need to take.
