Display User's Full Name from Created By field Dataverse column to use in PowerAutomate

Add a "Get Row ID" action to your flow and with the table name "Users" in "Row ID" add the created by field from your trigger step, "When a row is added, modified or deleted". See below

Then I use a variable "Initialize variable" so I can use the value in later steps. Full name is from the action step "CreatorData" (My custom name)

The results:

In my file name of a pdf that was created