I am using Blueimp Jquery File Upload plugin to upload files asynchronously. It works well in most other browsers (with a few minor issues) - on IE, I see this issue that th
In case anyone is still having this issue with direct upload to S3 the solution is to add a success_action_status field with the value of "201". Make sure that that you include it as part of the policy data as well since they have to match.
Apparently when receiving the upload from IE9 S3 will return an empty string. To get it to return XML, which the file uploader needs, you have to tell it return a status of 201.