diff --git a/lib/Controller/Aria2Controller.php b/lib/Controller/Aria2Controller.php
index 2b57d99..6c2a556 100644
--- a/lib/Controller/Aria2Controller.php
+++ b/lib/Controller/Aria2Controller.php
@@ -35,9 +35,7 @@ class Aria2Controller extends Controller
         $this->downloadDir = $this->settings->get('ncd_downloader_dir') ?? "/Downloads";
         OC_Util::setupFS();
         //$this->config = \OC::$server->getAppConfig();
-
         $this->aria2 = $aria2;
-
         $this->aria2->init();
         $this->dbconn = new DBConn();
     }
@@ -84,8 +82,8 @@ class Aria2Controller extends Controller
     }
     public function Update()
     {
-        File::syncFolder($this->downloadDir);
-        return new JSONResponse([]);
+        $resp = File::syncFolder();
+        //return new JSONResponse($resp);
     }
 
     private function createActionItem($name, $path)
@@ -99,6 +97,7 @@ class Aria2Controller extends Controller
     {
         //$path = $this->request->getRequestUri();
         $counter = $this->aria2->getCounters();
+        $this->Update();
         switch (strtolower($path)) {
             case "active":
                 $resp = $this->aria2->tellActive();
diff --git a/lib/Tools/Aria2.php b/lib/Tools/Aria2.php
index 4cf2e15..a22c1c1 100644
--- a/lib/Tools/Aria2.php
+++ b/lib/Tools/Aria2.php
@@ -361,9 +361,9 @@ user-agent=Transmission/2.77
 seed-ratio=0.1
 bt-seed-unverified=true
 max-overall-upload-limit=1M
-#on-download-complete=$this->onDownloadComplete
-#on-download-error=$this->onDownloadError
-#on-download-start=$this->onDownloadStart
+#on-download-complete=
+#on-download-error=
+#on-download-start=
 save-session=$this->sessionFile
 input-file=$this->sessionFile
 log=$this->logFile
diff --git a/lib/Tools/File.php b/lib/Tools/File.php
index 0d220b4..4a8113b 100644
--- a/lib/Tools/File.php
+++ b/lib/Tools/File.php
@@ -2,21 +2,33 @@
 namespace OCA\NCDownloader\Tools;
 
 use OCA\NCDownloader\Tools\Helper;
-use OC\Files\Filesystem;
+use OCA\NCDownloader\Tools\Settings;
 use OC\Files\Utils\Scanner;
 use \OCP\EventDispatcher\IEventDispatcher;
 
 class File
 {
-    public static function syncFolder($dir)
+    public static function syncFolder($dir = null)
     {
         $user = \OC::$server->getUserSession()->getUser()->getUID();
+        if (!isset($dir)) {
+            $settings = new Settings($user);
+            $downloadDir = $settings->get('ncd_downloader_dir') ?? "/Downloads";
+            $rootFolder = Helper::getUserFolder($user);
+            $path = $rootFolder . "/" . ltrim($downloadDir, '/\\');
+        } else {
+            $path = $dir;
+        }
+
+        $realDir =\OC::$server->getSystemConfig()->getValue('datadirectory') . "/" . $path;
+        if (!(Helper::folderUpdated($realDir))) {
+            return ['message' => "no change"];
+        }
         $logger = \OC::$server->getLogger();
         $scanner = new Scanner($user, \OC::$server->getDatabaseConnection(), \OC::$server->query(IEventDispatcher::class), $logger);
-        $path = Filesystem::getRoot() . "/" . ltrim($dir, '/\\');
         try {
             $scanner->scan($path);
-           // Helper::debug($logger->getLogPath());
+            // Helper::debug($logger->getLogPath());
             //$logger->warning($logger->getLogPath(),['app' =>'Ncdownloader']);
         } catch (ForbiddenException $e) {
             $logger->warning("Make sure you're running the scan command only as the user the web server runs as");
@@ -24,5 +36,7 @@ class File
 
             $logger->warning("Exception during scan: " . $e->getMessage() . $e->getTraceAsString());
         }
+        return ['message' => "changed"];
+
     }
 }
diff --git a/lib/Tools/Helper.php b/lib/Tools/Helper.php
index 5f639ea..94e3107 100644
--- a/lib/Tools/Helper.php
+++ b/lib/Tools/Helper.php
@@ -3,6 +3,7 @@
 namespace OCA\NCDownloader\Tools;
 
 use OCA\NCDownloader\Tools\aria2Options;
+use OC\Files\Filesystem;
 
 class Helper
 {
@@ -242,7 +243,7 @@ class Helper
     public static function getTableTitles($type = null)
     {
         $general = ['filename', 'status', 'actions'];
-        if(!isset($type)){
+        if (!isset($type)) {
             return $general;
         }
         $titles = [
@@ -253,5 +254,38 @@ class Helper
         ];
         return $titles[$type];
     }
+    // the relative home folder of a nextcloud user
+    public static function getUserFolder($uid = null)
+    {
+        if (!empty($rootFolder = Filesystem::getRoot())) {
+            return $rootFolder;
+        } else if (isset($uid)) {
+            return "/" . strtolower($uid) . "/files";
+
+        }
+        return '';
+    }
+
+    public static function folderUpdated($dir)
+    {
+        if (!file_exists($dir)) {
+            return false;
+        }
+        $checkFile = $dir . "/.lastmodified";
+        if (!file_exists($checkFile)) {
+            $time = \filemtime($dir);
+            file_put_contents($checkFile, $time);
+            return false;
+        }
+        $lastModified = (int) file_get_contents($checkFile);
+
+        $time = \filemtime($dir);
+
+        if ($time > $lastModified) {
+            file_put_contents($checkFile, $time);
+            return true;
+        }
+        return false;
+    }
 
 }