SWFUpload Upload failure Solving ideas

SWFUpload Upload Failure Solver
if (Empty ($Filedata) | |!is_uploaded_file ($FILEDATA))
{
echo "Error:upload error!";
Exit (0);
}
Always stuck in this position to get the value of Filedata

Window.onload = function ()
{
SWFU = new SWFUpload (
{
Backend Settings
Upload_url: "swfuploadvideo.php",
Post_params: {"PHPSESSID": " "," Dopost ":" "," Utype ":" Shangjia "},
File Upload Settings
File_size_limit: "MB",//2MB
File_Types: "*.flv",
File_types_description: "Select FLV format Video",
File_upload_limit: "1",


File_queue_error_handler:filequeueerror,
File_dialog_complete_handler:filedialogcomplete,
Upload_progress_handler:uploadprogress,
Upload_error_handler:uploaderror,
Upload_success_handler:uploadsuccess,
Upload_complete_handler:uploadcomplete,

Button_image_url: "Img/smallspyglasswithtransperancy_17x18.png",
button_placeholder_id: "Spanbuttonplaceholder",
BUTTON_WIDTH:250,
Button_height:18,
Button_text: ' Select Local video (maximum video, multi-select) ',
Button_text_style: '. button {Font-family:helvetica, Arial, Sans-serif; font-size:12pt;}. buttonsmall {font-size:10p T }',
button_text_top_padding:0,
Button_text_left_padding:18,
Button_window_mode:SWFUpload.WINDOW_MODE. TRANSPARENT,
Button_cursor:SWFUpload.CURSOR.HAND,

Flash Settings
Flash_url: ". /images/swfupload/swfupload.swf ",

Custom_settings: {
Upload_target: "Divfileprogresscontainer",
Thumbnails_target: "Thumbnails"
},

Debug Settings
Debug:true
});
};

------Solution--------------------
Too little information. cannot be judged.
------Solution--------------------
Since, the hint "$Filedata" can not get, in the above code to find the reason, is when to assign value to $filedata, slowly upward analysis, see
------Solution--------------------
Upload1 = new SWFUpload ({.... file_post_name: "Filedata", ...});

is not a matter of this attribute, the sending name of the file data.
If this is not the case, it does not have access to the file data and information.

PHP section needs to get data by $_files["Filedata")
The problem should be in this part.

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