Sometimes, the Submitted By field in a document library isn't populated so we are building a flow to check if the field is blank. If it is blank, the flow should automatically populate the field with Created by.
Submitted by field is a People Picker field. The field we can pull up is Submitted by Claims. Don't know what will turn out when the Submitted by Claims field is populated by Created by -- we would expect the Submitted By field is populated with Display name.