Apple’s newish photo format is .heic. On one of the previous updates photos are saved in this format by default.
You can export it as a jpeg or you can go into settings and change the default from heic to jpeg or others for future photos.
2015 Forester 2801QS GTS
TOAD-Hobie Mirage Pro Angler 14 kayak and Yamaha Zuma 50cc scooter on a custom trailer.