Importing a list to update database records
My company does customer surveys pretty frequently and we just switched over to Marketo so this is a bit new. We assign each of our customers their own unique survey link so we can get more information comparing their responses to their account. When I upload a list with their individual survey link it creates a new lead in the database. Is it possible to do a list upload to update the existing record? Or will the new record just have to be deleted once it is sent?