It could generate too many notification emails. DriveHQ does not support it for regular folders or regular upload methods.
If you share a folder with others, you can check the Checkbox "Send share change notification". When other users upload a file to the shared folder, they will be prompted to send a "Share change notification email".
If you use our "True Drop Box Folder" feature (which enables anybody to upload files to you securely), when a user uploads a file to the Drop Box folder, it will automatically send a notification email to you.