2 Step Authentication for recipient to Open the file(s) - This is a feature that can be disabled/uncheck by the Owner of the account.
...
RECIPIENTS VIEW/RETRIEVAL: When recipient clicks on the request link, they will see this page and it will display that the 4 6 digit pin code (numbers and letters OR numbers only) will go to either your email or mobile (depending on where the request was sent).
Click GET CODE
...
...
Code was sent to Email:
...
Type Code click Enter
...
If you enter a wrong code you will get this error to try again:
...
Documents are now ready for download
...