django-filer，easy_thumbnails和S3：保存图像但不保存图像

I'm trying to set up my S3 storage backend with django-filer. When I upload an image through the filer admin interface the image is actually uploaded (I can see it in my bucket/filer_public/...), however, what I see on the clipboard is "undefined" and no icon of the image. I can't see the preview in the Change Image view neither, although the link "Full size preview" is right and when I click it I can see the image from S3.I'm trying to set up my S3 storage backend with