An uploaded file with CO is not automatically included
When creating a CO with "Attachment" possibilities ( like a Note ) you can Upload a file and include this with the CO.
When you use the "Browse" button, the file is uploaded and added into your Repository but NOT as attachment in the created CO.
This is confusing, the most of the people think the file is automaticcaly attached. Now you need to do this manually and this will be forgotten.