Hello @TraceyP41,
I do apologize for any inconvenience, but at this time we can not add additional emails to an existing automated series. Although, you can edit existing emails while the series is live. Which means a workaround I have found that works well is to add blank templates that will later be edited when you are ready. That way your series can be active and live and start sending, but the blank templates will be edited before it's time for them to be sent. Thanks!
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