You can use this action to change the name of a file

Move File

Description of the parameters:

number 1Source: The path and the name of the file that you want to rename. Instead of typing the path, you can use the Browse button to find the file. Or you can use the % sign to insert Text variables or Special Folders in this parameter.

number 2Destination: The new name of the file. You can use the % sign to select the variables that you want.