External Eventing with Google Sheets - Cannot Choose External Event

I installed the Google Sheets Add-on “AppSheet Events” as shown in the video tutorial below.
(1) AppSheet Automation: External eventing with Google Sheets - YouTube

(1) Successfully Installed Add-on
(2) Successfully inserted API Key into Sheets Add-on (using incognito window method)
(3) Created a new Automation Bot in AppSheet

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Issue: There is no apparent way to select the google sheet event as an event type like in the video.

The video tutorial is silent on how to do this and there is nothing in the documentation I could find.

How do we specify in AppSheet that the event is an external change in Google Sheets?

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