Generally, it can be a problem sending large data files to CED by email - files larger than 5 megabytes cause quite a load on email servers and our system is set to reject files larger than 20 megabytes. We have looked at setting up a ftp server but the security considerations have been ... complicated.
So we have found another method making use of a firm that hosts a file transfer service, which I hope will prove satisfactory for all of us. You can get access to the file upload form on our website - go to the "Sending big files to CED" item in the Support section of the CED web site - the link is: http://ced.co.uk/support/sendbigfiles