Sharing files securely from within the iPhone app is super easy. Watch the video below to see just how simple it is:
Launch the app from your home screen.
Enter your passcode (if you've configured one).
Choose the file that you want to share, and swipe right.
A menu appears. Choose the type of share that you want to create, either E-mail link (public), or E-mail secure link (secure).
Once you have entered the recipients' email addresses, tap Done.
Your file has now been shared.