To find and add iMessage apps (Disney Stickers packs) that you have downloaded:
Launch Messages and tap the App Drawer icon.
Tap the Store icon.
Select the Manage tab at the top and tap the switch of the app you would like to turn on.
NOTE: If Automatically Add Apps is set to ON, any iMessage apps you download will appear in the app drawer. You can also manually add downloaded apps to the app drawer.
- The app should now appear in the App Drawer within iMessages.