I need to track SharePoint users who access a document. I have a flow that will receive an HTTP request, open the document from the library, and create an item in a SP list showing when the link was clicked. I want to automatically populate the list with the user who is currently logged into SP and clicked the link. I have tried various methods and they all return me, as the owner of the flow. How do I capture the logged-in SP user and incorporate into my flow? I have found some info that says in SP Online the current user can be found in "_spPageContextInfo.userLoginName" but I am unsure as to how to use this in my flow. Can it be accessed through the JSON schema in "When a HTTP Request is received? I'm fairly new to Power Automate and struggling to change over from SharePoint Designer. Thanks!