@flexcodec okay so the Title column wont have same values in multiple rows? If yes, in the Apply to each action, you can use Get Items action with Filter Query as below. Then use Condition action to check the length of items returned by Get Items to see if that row already exists in list. In the yes branch of condition action, you can use Update Item action using the ID value from Get Items to update the item in the list, and in the No branch you can keep the Create Item action as you currently have now
Title eq 'select the title column value from dynamic content here'
