diff --git a/htdocs/core/ajax/flowjs-server.php b/htdocs/core/ajax/flowjs-server.php
new file mode 100644
index 00000000000..6177b6fda35
--- /dev/null
+++ b/htdocs/core/ajax/flowjs-server.php
@@ -0,0 +1,146 @@
+<?php
+/* Copyright (C) 2012 Laurent Destailleur <eldy@users.sourceforge.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ *       \file       htdocs/core/ajax/bankconciliate.php
+ *       \brief      File to set data for bank concilation
+ */
+
+if (!defined('NOTOKENRENEWAL')) {
+	define('NOTOKENRENEWAL', '1'); // Disables token renewal
+}
+if (!defined('NOREQUIREMENU')) {
+	define('NOREQUIREMENU', '1');
+}
+if (!defined('NOREQUIREHTML')) {
+	define('NOREQUIREHTML', '1');
+}
+if (!defined('NOREQUIREAJAX')) {
+	define('NOREQUIREAJAX', '1');
+}
+if (!defined('NOREQUIRESOC')) {
+	define('NOREQUIRESOC', '1');
+}
+//if (! defined('NOREQUIRETRAN'))  define('NOREQUIRETRAN','1');    // Required to know date format for dol_print_date
+
+// Load Dolibarr environment
+require '../../main.inc.php';
+
+
+$action = GETPOST('action', 'aZ09');
+$module = GETPOST('module', 'aZ09');
+$flowFilename = GETPOST('flowFilename', 'alpha');
+$flowIdentifier = GETPOST('flowIdentifier', 'alpha');
+$flowChunkNumber = GETPOST('flowChunkNumber', 'alpha');
+$flowChunkSize = GETPOST('flowChunkSize', 'alpha');
+$flowTotalSize = GETPOST('flowTotalSize', 'alpha');
+
+/*
+ * Action
+ */
+
+
+top_httphead();
+dol_syslog(join(',', $_GET));
+
+if ($_SERVER['REQUEST_METHOD'] === 'GET' ) {
+	$temp_dir = DOL_DATA_ROOT.'/'.$module.'/temp/'.$flowIdentifier;
+	$chunk_file = $temp_dir.'/'.$flowFilename.'.part'.$flowChunkNumber;
+	if (file_exists($chunk_file)) {
+		 header("HTTP/1.0 200 Ok");
+	} else {
+		header("HTTP/1.0 404 Not Found");
+	}
+}
+
+
+
+// loop through files and move the chunks to a temporarily created directory
+if (!empty($_FILES)) foreach ($_FILES as $file) {
+	// check the error status
+	if ($file['error'] != 0) {
+		dol_syslog('error '.$file['error'].' in file '.$flowFilename);
+		continue;
+	}
+
+	// init the destination file (format <filename.ext>.part<#chunk>
+	// the file is stored in a temporary directory
+	$temp_dir = DOL_DATA_ROOT.'/'.$module.'/temp/'.$flowIdentifier;
+	$dest_file = $temp_dir.'/'.$flowFilename.'.part'.$flowChunkNumber;
+
+	// create the temporary directory
+	if (!dol_is_dir($temp_dir)) {
+		dol_mkdir($temp_dir, '', 0777);
+	}
+
+	// move the temporary file
+	if (!move_uploaded_file($file['tmp_name'], $dest_file)) {
+		dol_syslog('Error saving (move_uploaded_file) chunk '.$flowChunkNumber.' for file '.$flowFilename);
+	} else {
+		// check if all the parts present, and create the final destination file
+		createFileFromChunks($temp_dir, $flowFilename, $flowChunkSize, $flowTotalSize);
+	}
+}
+
+
+/**
+ * Check if all the parts exist, and
+ * gather all the parts of the file together
+ * @param string    $temp_dir - the temporary directory holding all the parts of the file
+ * @param string    $fileName - the original file name
+ * @param string    $chunkSize - each chunk size (in bytes)
+ * @param string    $totalSize - original file size (in bytes)
+ * @return bool     true if Ok false else
+ */
+function createFileFromChunks($temp_dir, $fileName, $chunkSize, $totalSize)
+{
+
+	dol_syslog(__METHOD__, LOG_DEBUG);
+	// count all the parts of this file
+	$total_files = 0;
+	$files = dol_dir_list($temp_dir, 'files');
+	foreach ($files as $file) {
+		if (stripos($file, $fileName) !== false) {
+			$total_files++;
+		}
+	}
+
+	// check that all the parts are present
+	// the size of the last part is between chunkSize and 2*$chunkSize
+	if ($total_files * $chunkSize >=  ($totalSize - $chunkSize + 1)) {
+		// create the final destination file
+		if (($fp = fopen($temp_dir.$fileName, 'w')) !== false) {
+			for ($i=1; $i<=$total_files; $i++) {
+				fwrite($fp, file_get_contents($temp_dir.'/'.$fileName.'.part'.$i));
+				dol_syslog('writing chunk '.$i);
+			}
+			fclose($fp);
+		} else {
+			dol_syslog('cannot create the destination file');
+			return false;
+		}
+
+		/*// rename the temporary directory (to avoid access from other
+		// concurrent chunks uploads) and than delete it
+		if (rename($temp_dir, $temp_dir.'_UNUSED')) {
+			rrmdir($temp_dir.'_UNUSED');
+		} else {
+			rrmdir($temp_dir);
+		}*/
+	}
+	return true;
+}