Setting Up WhatsApp Reply Listeners in Your App's Workflow

Hey team, I’m confused on how to get my app to include a listener for a WhatsApp reply. Since I have the initial trigger come from email, I never use the Message Received trigger from WhatsApp. I’m wondering if that’s why once I get to a WhatsApp node that sends a message, the loop stops and there’s no way to get it to respond to my WhatsApp reply. (WhatsApp works perfectly in separate test agent). Do I need something after the “Send action whatsapp” node?