[Answered ]-File download dialog for photos hosted on Amazon S3

See if you can get S3 to specify the content type of the files as application/octet-stream.

I have just verified this. In the AWS management console you can select a file, click on Properties, select the Metadata tab and then set the Content-Type to “binary/octet-stream”. If it’s e.g. image/jpeg it will display in the browser. If it’s changed to binary/octet-stream it forces the browser to download it instead.