Complex sentence: The Spot could also be used to set up e-mail attachments, by the user dragging the content to the Spot, then dragged the recipient's photo to the Spot, after which an email could be sent containing those attachments.
Split into simpler sentences: The Spot could also be used to set up e-mail attachments. To attach content to an email, the user dragged the content to the Spot, then dragged the recipient's photo to the Spot, after which an email could be sent containing those attachments.