diff -u b/modules/media_directories_ui/media_directories_ui.module b/modules/media_directories_ui/media_directories_ui.module
--- b/modules/media_directories_ui/media_directories_ui.module
+++ b/modules/media_directories_ui/media_directories_ui.module
@@ -400,7 +400,7 @@
     '#title' => t('Enabled Media types'),
     '#description' => t('Select media types to use in combined upload. This will work only for media types that have upload field.'),
     '#options' => $options,
-    '#default_value' => $config->get('enabled_media_types'),
+    '#default_value' => ($config->get('enabled_media_types') != NULL ? $config->get('enabled_media_types') : []),
   ];
 
   array_unshift($form['#submit'], 'media_directories_ui_config_form_submit');
diff -u b/modules/media_directories_ui/src/Form/MediaCombinedUploadForm.php b/modules/media_directories_ui/src/Form/MediaCombinedUploadForm.php
--- b/modules/media_directories_ui/src/Form/MediaCombinedUploadForm.php
+++ b/modules/media_directories_ui/src/Form/MediaCombinedUploadForm.php
@@ -128,13 +128,6 @@
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function getUploadLocation(array $settings) {
-    return 'public://media_directories_combined';
-  }
-
-  /**
    * Collect all supported extensions.
    *
    * @param $target_types