Index: branches/5.2.x/core/kernel/utility/formatters/upload_formatter.php
===================================================================
diff -u -N -r16596 -r16650
--- branches/5.2.x/core/kernel/utility/formatters/upload_formatter.php	(.../upload_formatter.php)	(revision 16596)
+++ branches/5.2.x/core/kernel/utility/formatters/upload_formatter.php	(.../upload_formatter.php)	(revision 16650)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: upload_formatter.php 16596 2017-07-26 15:17:37Z alex $
+* @version	$Id: upload_formatter.php 16650 2020-12-17 08:57:57Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -242,18 +242,29 @@
 					$object->SetError($field_name, 'cant_save_file', 'la_error_cant_save_file');
 				}
 				else {
-					$real_name = $this->_getRealFilename($value['name'], $options, $object);
-					$file_name = $this->FullPath . $real_name;
+					$tmp_path = WRITEABLE . '/tmp/';
+					$filename = $this->fileHelper->ensureUniqueFilename($tmp_path, $value['name'] . '.tmp');
+					$tmp_file_path = $tmp_path . $filename;
 
-					$moved = move_uploaded_file($value['tmp_name'], $file_name);
+					$moved = move_uploaded_file($value['tmp_name'], $tmp_file_path);
 					$storage_format = isset($options['storage_format']) ? $options['storage_format'] : false;
 
 					if ( $storage_format ) {
 						/** @var kUploadHelper $upload_helper */
 						$upload_helper = $this->Application->recallObject('kUploadHelper');
-						$moved = $upload_helper->resizeUploadedFile($file_name, $storage_format);
+						$moved = $upload_helper->resizeUploadedFile($tmp_file_path, $storage_format);
 					}
 
+					if ( $moved ) {
+						$real_name = $this->_getRealFilename(
+							kUtil::removeTempExtension(basename($tmp_file_path)),
+							$options,
+							$object
+						);
+						$file_name = $this->FullPath . $real_name;
+						$moved = rename($tmp_file_path, $file_name);
+					}
+
 					if ( !$moved ) {
 						$object->SetError($field_name, 'cant_save_file', 'la_error_cant_save_file');
 					}