Using HTML5 to upload could split a file into several part and cause some problems.

Following are some solutions for this issue:

1. http://stackoverflow.com/questions/9011138/handling-pluploads-chunked-uploads-on-the-server-side
2. http://stackoverflow.com/questions/7853467/uploading-a-file-in-chunks-using-html5
3. http://www.plupload.com/punbb/viewtopic.php?id=1259