Hi,
In v8 you no longer need to use the button mentioned, as you can utilize the Automation feature to send automatic emails for your newly created articles.
In the video, someone demonstrated a more advanced approach by using Joomla custom article fields within the Automation, which adds greater flexibility to the process. Thank you for sharing this video with us.
For additional information on Automations, please refer to the documentation provided here: https://docs.acymailing.com/main-pages/automations