CSOCurrent en:Expose File Names in Notifications
Aus Cryptshare Documentation
This option allows you to control whether the file names of your file attachments are part of the notification email to the recipient and the corresponding download confirmation. Since the notification mails are regular, unencrypted emails, the option should be disabled for security reasons, if the file name already contains confidential information. The recipient will only see the number of files which are available for download in this case.