Use this trigger to start a flow after receiving an uncaught message (a message not handled by any of your other flows or triggers). We refer to this as the "catch-all" trigger, as it can be used to route uncaught messages to any of your flows.
To create a catch-all trigger:
1. Navigate to the "Flows" tab and click the "Create Trigger" box.
2. Click the "Start a flow after receiving a message not handled elsewhere" option.
3. Choose the flow you want to start.
4. Click the "Create Trigger" box