Hi,

 

I suggest you use cookie to pass the value.

 

We will improve this part in the future.

 

the more advanced way is using JavaScript ,

 

get the uploader object , and use

 

uploader.SetClientData("yourdata");

 

at server handler code for validation, you can use $_POST["_AjaxUploaderClientData_"] to get that value.

 

Regards,
Terry