To add a picture, document or video follow these steps:
1) Click on the paperclip attachment icon. This icon is present in various locations including New Message, Schedule Message, and on the main screen's Message List.
2) The Attach Media box will appear
3) Click "Browse"
4) Your computer will open up a screen for you to choose a file to attach
5) Choose a file and click "Open"
6) The Attach Media box will now show your uploaded file(s). Click "Attach" to proceed with attaching your file(s) to the message.
7) Thumbnails of your attached media will appear near the attachment paperclip.
8) Click "Send" after filling out the recipient and optional message.
9) You will see the picture, file or video in the Message List of the contact/conversation you messaged