i set :prefix to a path prefix in the swf_upload_tag, but it doesn't seem to work.
It works for me :)
You will need to supply some more information to help me understand what you are doing.
This may help: http://tinyurl.com/dy7wdk
it doesn't works for me! :( I set :prefix but it doesn't seem to work.. I need have a pre-created "folder" in my S3 bucket??