5. Add Files, you can add files up to the max size displayed in the limitations section 10).
6. Limitations — Message Size, Quota and File Extension Limitations.
11. A Private Message is a message where the Message is not included in the email sent to the recipients.
When sending a Private Message:
The recipients will get a generic email telling them to click on the link to view the message.
You will get a read receipt when the recipient has viewed the message as well as when any attachments has been downloaded.
You can send a Private Message without any attachments.
It's not possible to send a Private Message with the permission that Anyone can download — in order to send a Private Message, authentication is required.
12. When you're ready, please hit Send. If uploads are taking a long time, you can check the checkbox to "send when uploads are done".