The iPhone has this cool feature enabled by default which makes all photos, Live photos. That is it's a photo bundled with a quick 5 second video. I got one of my daughter jumping off a bed when she was 5 - it's amazing. But let's be real, 99% of the time you just want a simple photo. Many times clients send me pictures of their equipment or their screen and live photos are enabled. It drives me a little bit bonkers. Here is how to disable it - tap the concentric circles in the upper right-hand corner of the Photo app.
LIVE Photos Enabled
Disabled, i.e. normal photos