This section takes you step-by-step through turning off auto-play for animated message effects on your iOS device, complete with pictures of the screens to help.
1. Tap the Settings icon to open the Settings app. Scroll down through and tap Accessibility.
2. Look under the Vision section and tap Motion.
3. On the Motion screen, tap Auto-Play Message Effects to set the toggle switch to Off.
4. You can still play message effects manually. Simply tap the Replay 'effect' button that appears under any message containing an effect.