Message Scenarios (add_appt) - action : activity is created

Hi 

We have configured a message scenario that when creating a new activity with a schedule (date and time), the system sends a notification to the field resource 
(notification push and collaboration) notifies of a ticket with an appointment

But when I have an unscheduled ticket that is already in the resource's queue for service, and then I update the schedule (Date and time),
the notification is not sent because the scenario only deals with the creation of the activity and not with the update.

Is it possible to send this notification when the activity is modified? The idea is to update an