Quatrix® is a great tool for acquiring files from your contacts or users with the assurance of security, detailed tracking and PGP encryption (if enabled for your account).
To request files on the Contacts tab select the contact you want to return files from and click on the Request icon, compose the message and click the Send button on the Request files dialog.
To request files on the Share tab select the Recipient(s) can return files check box in the Optional Settings section when you share files.
Your users or contacts receive links that uniquely point to a form to securely send files to you. They cannot edit the recipient address so the facility cannot be misused for general file sharing.