live photos wont play when hovering over them, but they do play when scrolling thorugh pictures

Hi there, YumCimil.
After reviewing your post, I see that Live Photos you've taken on your iPhone play only when you're scrolling through the Photos application on your iPhone. They don't play when you simply "hover". I'm happy to help.
Take and edit Live Photos -- Follow the steps below to watch your Live Photo play.

See your photos come to life

After you take a Live Photo, you can relive the moment instantly from the Photos app.

1. Open the Photos app.
2. Go to the Photos tab.
3. Tap the Live Photo.
4. Firmly press the screen and hold.

You can enjoy your Live Photo every time you unlock your iPhone too. Just set it as your Lock screen wallpaper.

Have a great day!

Thanks for getting back to us, YumCimil.
Change 3D Touch sensitivity on your iPhone 6s, iPhone 6s Plus, iPhone 7, or iPhone 7 Plus -- Make sure 3D Touch is on and adjust the amount of pressure needed.

Let us know how that goes and take care!

Thank you again for checking and adjusting those settings, YumCimil. We'd like for you to do the following process then to reinstall the iOS on your iPhone 7 Plus.
Restart your iPhone, iPad, or iPod touch -- Restart your iPhone. Once it's returned to the Home screen, test the issue.
How to back up your iPhone, iPad, and iPod touch -- If restarting your phone didn't resolve the issue, please be sure to have a fresh backup to keep your personal information safe. In order to back up your Health data, the backup needs to be encrypted. iCloud does this automatically, but iTunes doesn't. If you'd like to use iTunes to back up your phone, refer to this article: About encrypted backups in iTunes
Restore your iPhone, iPad or iPod touch to factory settings -- This process will completely wipe the iPhone to allow a fresh copy of the iOS software to be installed. The first time through, select "Set up as a new iPhone". Feel free to sign into iTunes & App Store and iCloud. Take another Live Photo and test. If everything is working as it should, use the "Restore from a backup" link located in the "Get Help" section. Again, please let us know if the issue has been resolved.

Cheers!

If your iPhone is on Low Power Mode it will not work, that was my issue and this resolved it.