When you want to introduce another channel, you’ll need to use the "+" buttons on the bottom of the content block - as shown with the Blog post in the image below.

Content attached to these bottom connectors is published when any event is triggered by the attached content block. In the image below, for example, content block 11 will be published when the player clicks either the first or second answer. Hence this content is independent of the player choice. There are two connectors per content block so hence the maximum content any player can receive on any event is three.