LivePhotos

OK, are they aware of this?

On that same front, the receiver will just see a standard photo when they get it, except with the word “Live” watermarked in small print. That’s how the receiver knows that they can forcefully press on the photo to activate 3D Touch and view the Live Photo animation.

Live Photos only work in Apple’s own apps. Don’t get your hopes up about Live Photos coming to Android, either. With the iOS API, Google is more than welcome to enable Live Photos in its iOS apps, but it’s doubtful that Apple will let Android users get in on the iPhone's fun.

https://www.guidingtech.com/51415/send-live-photos-iphone-6s/

Darn it, we need more help in here.