One upload per angle, once a month — front is required, side and back are optional but recommended since they show changes the front angle hides. You get a reminder on the 1st. Photos are grouped into a monthly timeline like the one above, and the compare tool lets you slide between any two dates on the same angle — comparing front-to-front, never front-to-side. Everything here is private to you and your coach: stored with expiring, non-public links, never used anywhere else unless you separately opt in.