Actions will only apply to inspections that are created after the Action was added in your Company Actions page. If you have an inspection that is already created, and you want to make a new action apply to that existing inspection, you need to use the Import New Actions button: 

It is important to note, a new Action will not fire if the Triggering Event has already happened in that report. 

For example: I added a new Action to Send an Email > To Clients > At Time of Inspection Scheduled > On All Inspections. 

If I have any existing inspections that have already been "Scheduled" (the Triggering Event), my Action will not apply, even if I use the Import New Actions button, because that event is in the past.

On the other hand, if I have an event that was just scheduled yesterday, and I added an Action to Send an Email > To Clients > At Time of Reports Published > On All Inspections, I can click the Import New Actions button, and the emails will fire when the Report is Published (the Triggering Event), because it will happen in the future.

To put it simply: a new Action must be imported to an inspection before the triggering event occurs.

New Actions will always apply to all New Inspections created after the Action was created in your Company Actions page.