How to setup assignment submission notifications for tutors

stedmana Your post was very useful and the only walk-through I have found for getting notifications when Assignments are submitted in teams. 

However, when a scheduled assignment was posted, I was notified for each student because their files had been modified. It shows as modified by 'SharePoint App'.

I want to use Trigger settings to write an expression for a condition but I don't know what to call the objects and how to parse it. How do I refer to SharePoint App as the user who modified it. I put a tag in the Action body to display modified by's email address, but it seems to return 1 for that when SharePoint App triggers it.

So I am trying something like this @not(equals(triggerBody()?['Modified']?['email'], '1')) in the Trigger Conditions box but I really haven't found any discussions of expression and triggers trying to achieve the exclusion of SharePoint App.

Perhaps something in your original Action tags avoids this? I skipped checkoutuser and I couldn't find authordisplay in Power Automate.