I recently ran into the issue where we made a big mistake in a price on an email. The email was sent and there was nothing I could do. The price was on both the picture stored in my account as well as a .pdf link that was uploaded to my account. If I used my own FTP I would be able to update the .pdf link and re - upload and then end user would see the new file when they click on my email, without having to send another email. I wish constant contact worked that way.. all files uploaded were active.