Sometimes a document is so secret that once locked away, it can only be viewed once a deputy has unlocked it. An example of this would be something like your grandma's secret cake recipe, or the codes to a nuclear warhead.
If the person you are deputising requests a file unlock, you will receive a notification in your email. Login, and you will see the following in your Deputy vaultbox.
Click Approve or Reject as appropriate. Note that approving a file can take a little while, so please be patient!
Only one deputy is required to unlock the file, so once you have done this, the file is available to be opened.