There are three requirements In order to send files in the StudioCDN application. You need to have at least one recipient added, at least one file attached, and have a message subject and body. When the requirements are met the Send button will turn from grey to green. When you are ready to send, click the send button. A loading circle will appear at the top of the application. When a green checkmark appears, as shown in the picture below, the package has been sent.