diff --git a/main.inc.php b/main.inc.php
index 90da883..b08a087 100644
--- a/main.inc.php
+++ b/main.inc.php
@@ -1,7 +1,7 @@
 <?php
 /*
 Plugin Name: Bratonien Tools
-Version: 0.9.6.8.15
+Version: 0.9.6.8.16
 Description: Erweiterbare Administrationswerkzeuge fuer die Bratonien-Piwigo-Installation.
 Plugin URI: https://github.com/Terranom674/Piwigo_Bratonien_Tools
 Author: Bratonien
@@ -85,6 +85,82 @@ function bratonien_tools_prepare_private_album_permissions()
   bratonien_tools_grant_private_album_access($category_id, (int)$user['id']);
 }
 
+function bratonien_tools_preserve_private_album_access()
+{
+  global $user;
+
+  if (
+    !defined('IN_ADMIN')
+    || ($_SERVER['REQUEST_METHOD'] ?? '') !== 'POST'
+    || (string)($_GET['page'] ?? '') !== 'site_update'
+    || (string)($_POST['bratonien_connector'] ?? '') !== '1'
+    || empty($user['id'])
+  )
+  {
+    return;
+  }
+
+  $site_id = (int)($_GET['site'] ?? 0);
+  $user_id = (int)$user['id'];
+  if ($site_id < 1 || $user_id < 1)
+  {
+    return;
+  }
+
+  bratonien_tools_grant_connector_top_level_access($site_id, $user_id);
+  register_shutdown_function('bratonien_tools_grant_connector_top_level_access', $site_id, $user_id);
+}
+
+function bratonien_tools_grant_connector_top_level_access($site_id, $user_id)
+{
+  $site_id = (int)$site_id;
+  $user_id = (int)$user_id;
+  if ($site_id < 1 || $user_id < 1)
+  {
+    return;
+  }
+
+  $query = '
+SELECT id
+  FROM '.CATEGORIES_TABLE.'
+  WHERE site_id = '.$site_id.'
+    AND dir IS NOT NULL
+    AND id_uppercat IS NULL
+    AND status = \'private\'
+;';
+  $result = pwg_query($query);
+  $changed = false;
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $category_id = (int)$row['id'];
+    if ($category_id < 1)
+    {
+      continue;
+    }
+
+    $access_query = '
+SELECT 1
+  FROM '.USER_ACCESS_TABLE.'
+  WHERE user_id = '.$user_id.'
+    AND cat_id = '.$category_id.'
+  LIMIT 1
+;';
+    $access_result = pwg_query($access_query);
+    if (pwg_db_num_rows($access_result) > 0)
+    {
+      continue;
+    }
+
+    bratonien_tools_grant_private_album_access($category_id, $user_id);
+    $changed = true;
+  }
+
+  if ($changed && function_exists('invalidate_user_cache'))
+  {
+    invalidate_user_cache(true);
+  }
+}
+
 function bratonien_tools_grant_private_album_access($category_id, $user_id)
 {
   $category_id = (int)$category_id;