When a user file is uploaded to a survey, admins can configure a custom authentication based on custom unique codes provided by the uploaded file. The admins can then manually contact the uploaded recipients, share the survey with them, and ask them to complete the it using the unique codes assigned to each one of them.
Employee Surveys - FAQ - How Can I Send a Survey To a List of Recipients if I Don’t Have Their Emails, and Can I Use Custom Authentication for My Surveys?
