Which Pardot feature should be used to track prospect access to a file hosted outside...

When tracking access to files hosted outside of Pardot, the best feature to use is a Custom redirect. This tool allows Pardot users to create trackable URLs which can then be used to direct prospects to external files. The interactions with these URLs are tracked, capturing data whenever a prospect accesses the link. This enables marketers to gather analytics on file access even when the content itself is not hosted within Pardot, providing valuable insights into prospect engagement with external resources.