Update method in Oracle field service Plugin is not working

Summary:

I am on the route page of a technician, and there is a plugin button. When I click it, it will show all non-scheduled activities. I want to update an activity using the Update method of the plugin. It is not on the task page. So how do I load a single activity context from the plugin? So that I can perform the update method. I have received all non-sheduled activity in message and want to update a activity using update method.

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