title: Uploading multiple files simultaneously with Flex
body: <p>I have been working on a flex uploader, where the user can select multiple files.</p>
  
  <p>It works fine when the files are uploaded in a queue (one at a time), however as soon as I try to have it upload 2 files at once I run into issues.</p>
  
  <p>It seems that files will often lock up, and either stay at 1% until every other file is uploaded, or just not complete at all. There is never more than one file uploading at a time.</p>
  
  <p>Is there some issue with calling .upload on multiple files at once in Flex?</p>