音频上传名字为空

上传音频后名字是空，导致再次没法上传，报文件已存在

init : {

           'FilesAdded' : function(up, files) {
               plupload.each(files, function(file) {
               });
           },
           'BeforeUpload' : function(up, file) {
               var myDate = new Date();
               file.name = myDate.getTime();
               alert("BeforeUpload:" + file.name);
           },
           'UploadProgress' : function(up, file) {
               
               $("#third").show();
               var myDate = new Date();
               file.name = myDate.getTime();
               alert("UploadProgress:"+file.name);
           },
           'FileUploaded' : function(up, file, info) {
               alert("FileUploaded:" + file.name);
               alert("上传成功");
               var domain = up.getOption('domain');
               var res = jQuery.parseJSON(info);
               var sourceLink = domain + res.key;

上传失败：错误原因：文件已存在。(614：file exists)