To start, you’ll need the free DropBox app installed on your phone. You can do that through the App Store.

1. Then go into your Photos app and find one video you’d like to send.
2. In the lower left, click the box with the up arrow. You can add additional videos or photos by clicking them (watch for the blue checkmark for each file you add.)
3. Then click the Dropbox icon. You may need to scroll to the right to find it.
4. Now add the email address of the recipient under To: You can add an optional message and tell it where to store it in your dropbox.
5. Click Post and it will start sharing your file. With video files this can be quite long.
6. It’s done when a “File Shared” message pops up.