Do you have an automation running that you'd like to include past contacts in? Adding a segment to a campaign is very simple.
Please make sure your campaign has started and your auto-messages are live. The automation must be live for at least 15 minutes before you add a segment manually for contacts to receive messages.
In your automation, you'll see an Add Contacts button toward the top.
When you click the Add Contacts button, you'll go to a new page with 3 ways to add contacts. At the bottom, the last option will be to Add a Segment.
Click on the 'Type to Search' bar, and your full list of Segments will populate for you to choose from.
You can add only one segment to the campaign.
Once selected, click Add Segment.
You will now see the contacts from this segment have been pulled into your automation. Your auto-message(s) within the campaign will be scheduled and sent accordingly.