as i said during my insert or edit phase i have to upload pictures and if the picture is larger than 1mb i wont upload, the file column uploader hangs for ever!!!
my php.ini is configured as
Upload_max_filesize = 64M
post_max_size = 64M
my file colum is like:

/**
* 
* @ columna del file uploader;
* 
*/
$kul = new KoolUploader('');
$kul->width=100;
$kul->maxFileSize = 1024*1024*20; //20M
echo $kul->RegisterScript(false);
$column1 = new GridFileColumn();
$column1->DataField = "attachedfiles";
$column1->HeaderText = "Attached files";
$column1->KoolUploaderFolder = $KoolControlsFolder . "/KoolUploader/";
$column1->AllowedExtension = "jpg";
$column1->BaseDirectory = '.';
$column1->TableName = 'tbl_item_fotos';
$column1->IdColumn = 'id';
$column1->MultipleUpload = true;
$column1->AllowDelete = true;
$column1->AllowEdit = true;
$grid->MasterTable->AddColumn($column1);
$kulhandle = new KoolUploadHandler();
$kulhandle->allowedExtension = "jpg";
$kulhandle->allowDelete = true;
$kulhandle->allowEdit = true;
echo $kulhandle->handleUpload();

What is the error message reported?
Did you write an upload handle to handle the server side uploading as well?

well i got the error 413 so i did lots of researches and then conluded to solve this issue by editing http part of
/etc/nginx/nginx.conf
and adde the line:

http {
      client_max_body_size 64M;         
}