How to get the file path from a preview link?

By "correct user's auth", I meant that in order to get the extra information such as "path", you need to make that API call using an access token for the user account that owns the link.

E.g., see the /metadata/link documentation for in_dropbox and path:

"in_dropbox: Returns true if the file or folder is in the authenticated user's Dropbox. If no access token is passed, then this will always return false.

path: Returns the path to the file or folder relative to the shared link's root. If the in_dropbox value is true and the shared link points to a file or folder within the authenticated user's Dropbox, it returns the same path that would be returned by the /metadata endpoint. If the request is made without an authenticated user or the shared link is not in the authenticated user's Dropbox, this will always return null."