diff -u b/core/modules/media/src/Controller/MediaController.php b/core/modules/media/src/Controller/MediaController.php
--- b/core/modules/media/src/Controller/MediaController.php
+++ b/core/modules/media/src/Controller/MediaController.php
@@ -75,6 +75,7 @@
    * {@inheritdoc}
    */
   public function addTitle($entity_type_id, Request $request = NULL) {
+    $this->request = $request;
     $title = parent::addTitle($entity_type_id);
 
     // Change title for the file widget modal.
diff -u b/core/modules/media/src/MediaForm.php b/core/modules/media/src/MediaForm.php
--- b/core/modules/media/src/MediaForm.php
+++ b/core/modules/media/src/MediaForm.php
@@ -258,6 +258,7 @@
     if ($fids) {
       $url = Url::fromRoute('entity.media.add_page', [], [
         'query' => [
+          'modal' => 'media_file',
           'field_id' => $field_id,
           'fids' => $fids,
         ],
reverted:
--- b/core/modules/media/src/Plugin/media/Source/File.php
+++ a/core/modules/media/src/Plugin/media/Source/File.php
@@ -93,11 +93,11 @@
     $mimetype = $file->getMimeType();
     $mimetype = explode('/', $mimetype);
 
+    $icon_names = array(
-    $icon_names = [
       $mimetype[0] . '--' . $mimetype[1],
       $mimetype[1],
       $mimetype[0],
+    );
-    ];
     foreach ($icon_names as $icon_name) {
       $thumbnail = $icon_base . '/' . $icon_name . '.png';
       if (is_file($thumbnail)) {