Merge branch 'MDL-64228-master' of git://github.com/jleyva/moodle

diff --cc repository/nextcloud/lib.php
index f9c6b64,215b63d..faae5fc
--- 1/repository/nextcloud/lib.php
--- 2/repository/nextcloud/lib.php
+++ b/repository/nextcloud/lib.php
@@@ -428,7 -428,11 +428,11 @@@ class repository_nextcloud extends repo
          }
  
          if (!$this->client->is_logged_in()) {
 -            $this->print_login_popup(['style' => 'margin-top: 250px']);
+             if (!empty($options['offline'])) {
+                 // Right now, we can't download referenced files for offline if the client is not authenticated.
+                 send_file_not_found();  // Use this function because it enforces a 404 error.
+             }
 +            $this->print_login_popup(['style' => 'margin-top: 250px'], $options['embed']);
              return;
          }