Благодаря [url=http://dev.1c-bitrix.ru/community/forums/forum6/topic27757/]теме[/url] нашёл решение
[CODE]if(count($_FILES)){
for($i=0;$i<count($_FILES);$i++){
$fid[$i] = CFile::MakeFileArray($_FILES["PROPERTY_FILE_18_".$i]["tmp_name"]);
$PROP["FILE"][$i] = array(
"VALUE" => $fid[$i],
"DESCRIPTION" => "none"
);
}
}
[/CODE]
[CODE]if(count($_FILES)){
for($i=0;$i<count($_FILES);$i++){
$fid[$i] = CFile::MakeFileArray($_FILES["PROPERTY_FILE_18_".$i]["tmp_name"]);
$PROP["FILE"][$i] = array(
"VALUE" => $fid[$i],
"DESCRIPTION" => "none"
);
}
}
[/CODE]