I will ask you a question for the first time.
I am using the plugin Subscribe2 to set up a WordPress update notification.
You will be notified when a new article is created, but you will not receive a notification when an existing article is edited and updated.
Is it possible to send a notification when editing an existing article?

I saw all the settings screens for Subscribe2, but there seemed to be no parts that can be set.

Applicable source code