Trying to pull the jpg from the url --
http://d2l8rsuugwg81r.cloudfront.net/Ro ... 00x450.jpg
Says "Access Denied" -
You'll need to set the ACL/Access Control List for any files in your bucket to "Read" and "ACP Read" for everyone (public). I don't think direct publisher will allow you to modify the channel code to generate valid S3 token credentials so setting the files to anonymous access/public is the easiest solution.