A silent push notification is a message that wakes a mobile app for processing without appearing on the device or producing sound or vibration. Silent push notifications are useful for performing background tasks such as sending custom keys, updating the app’s badge icon, fetching remote content, and enabling new features.
For more information, see the platform-specific documentation:
You can send silent push notifications using the Message, Automation, and Journey composers. You cannot combine a silent push notification with any other message type.
When you are in "Content" select the option "Silent Push Notification".