Working for me on 18.0. Was playing around with it the other day. Not sure what could be causing it. Maybe restore the device and see if it appears. When I installed 18.0 I used iTunes and the full IPSW.
Did you just set up a new phone? If so, give it a few days. It needs time to index and analyze your photos. (Might need to leave your phone locked and plugged in for it to do this.)
Did you just set up a new phone? If so, give it a few days. It needs time to index and analyze your photos. (Might need to leave your phone locked and plugged in for it to do this.)