diff -u b/core/modules/file/src/Plugin/Field/FieldFormatter/FileAudioFormatter.php b/core/modules/file/src/Plugin/Field/FieldFormatter/FileAudioFormatter.php
--- b/core/modules/file/src/Plugin/Field/FieldFormatter/FileAudioFormatter.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/FileAudioFormatter.php
@@ -25,2 +25,9 @@
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function getHtmlTag() {
+    return static::getMediaType();
+  }
+
 }
diff -u b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
--- b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/FileMediaFormatterBase.php
@@ -15,6 +15,14 @@
 abstract class FileMediaFormatterBase extends FileFormatterBase implements FileMediaFormatterInterface {
 
   /**
+   * Gets the HTML tag for a formatter.
+   *
+   * @return string
+   *   The HTML tag of this formatter.
+   */
+  abstract protected function getHtmlTag();
+
+  /**
    * {@inheritdoc}
    */
   public static function defaultSettings() {
@@ -50,8 +58,8 @@
         '#title' => $this->t('Display of multiple files'),
         '#type' => 'radios',
         '#options' => [
-          'tags' => $this->t('Use multiple @tag tags, each with a single source.', ['@tag' => '<' . static::getMediaType() . '>']),
-          'sources' => $this->t('Use multiple sources within a single @tag tag.', ['@tag' => '<' . static::getMediaType() . '>']),
+          'tags' => $this->t('Use multiple @tag tags, each with a single source.', ['@tag' => '<' . $this->getHtmlTag() . '>']),
+          'sources' => $this->t('Use multiple sources within a single @tag tag.', ['@tag' => '<' . $this->getHtmlTag() . '>']),
         ],
         '#default_value' => $this->getSetting('multiple_file_display_type'),
       ],
@@ -113,7 +121,7 @@
     $attributes = $this->prepareAttributes();
     foreach ($source_files as $delta => $files) {
       $elements[$delta] = [
-        '#theme' => 'file_' . static::getMediaType(),
+        '#theme' => 'file_' . $this->getHtmlTag(),
         '#attributes' => $attributes,
         '#files' => $files,
         '#cache' => ['tags' => []],
diff -u b/core/modules/file/src/Plugin/Field/FieldFormatter/FileVideoFormatter.php b/core/modules/file/src/Plugin/Field/FieldFormatter/FileVideoFormatter.php
--- b/core/modules/file/src/Plugin/Field/FieldFormatter/FileVideoFormatter.php
+++ b/core/modules/file/src/Plugin/Field/FieldFormatter/FileVideoFormatter.php
@@ -28,6 +28,13 @@
   /**
    * {@inheritdoc}
    */
+  protected function getHtmlTag() {
+    return static::getMediaType();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function defaultSettings() {
     return [
       'muted' => FALSE,
diff -u b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
--- b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileAudioFormatterTest.php
@@ -13,21 +13,33 @@
 
   /**
    * @covers ::viewElements
+   *
+   * @dataProvider dataProvider
    */
-  public function testRender() {
-    $field_config = $this->createMediaField('file_audio', 'mp3');
+  public function testRender($tag_count, $formatter_settings) {
+
+    $field_config = $this->createMediaField('file_audio', 'mp3', $formatter_settings);
 
     file_put_contents('public://file.mp3', str_repeat('t', 10));
-    $file = File::create([
+    $file1 = File::create([
+      'uri' => 'public://file.mp3',
+      'filename' => 'file.mp3',
+    ]);
+    $file1->save();
+
+    $file2 = File::create([
       'uri' => 'public://file.mp3',
       'filename' => 'file.mp3',
     ]);
-    $file->save();
+    $file2->save();
 
     $entity = EntityTest::create([
       $field_config->getName() => [
         [
-          'target_id' => $file->id(),
+          'target_id' => $file1->id(),
+        ],
+        [
+          'target_id' => $file2->id(),
         ],
       ],
     ]);
@@ -35,9 +47,25 @@
 
     $this->drupalGet($entity->toUrl());
 
-    $file_url = file_url_transform_relative(file_create_url($file->getFileUri()));
-    $this->assertSession()->elementExists('css', 'audio[controls="controls"]');
-    $this->assertSession()->elementExists('css', "audio > source[src='$file_url'][type='audio/mpeg']");
+    $file1_url = file_url_transform_relative(file_create_url($file1->getFileUri()));
+    $file2_url = file_url_transform_relative(file_create_url($file2->getFileUri()));
+
+    $this->assertSession()->elementsCount('css', 'audio[controls="controls"]', $tag_count);
+    $this->assertSession()->elementExists('css', "audio > source[src='$file1_url'][type='audio/mpeg']");
+    $this->assertSession()->elementExists('css', "audio > source[src='$file2_url'][type='audio/mpeg']");
+  }
+
+  /**
+   * Data provider for testRender.
+   *
+   * @return array
+   *   Provided data.
+   */
+  public function dataProvider() {
+    return [
+      [2, []],
+      [1, ['multiple_file_display_type' => 'sources']],
+    ];
   }
 
 }
diff -u b/core/modules/file/tests/src/Functional/Formatter/FileMediaFormatterTestBase.php b/core/modules/file/tests/src/Functional/Formatter/FileMediaFormatterTestBase.php
--- b/core/modules/file/tests/src/Functional/Formatter/FileMediaFormatterTestBase.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileMediaFormatterTestBase.php
@@ -39,11 +39,13 @@
    *   The formatter ID.
    * @param string $file_extensions
    *   The file extensions of the new field.
+   * @param string[] $formatter_settings
+   *   Settings for the formatter.
    *
    * @return \Drupal\field\Entity\FieldConfig
    *   Newly created file field.
    */
-  protected function createMediaField($formatter, $file_extensions) {
+  protected function createMediaField($formatter, $file_extensions, array $formatter_settings = []) {
     $entity_type = $bundle = 'entity_test';
     $field_name = Unicode::strtolower($this->randomMachineName());
 
@@ -66,7 +68,7 @@
     $display = entity_get_display('entity_test', 'entity_test', 'full');
     $display->setComponent($field_name, [
       'type' => $formatter,
-      'settings' => [],
+      'settings' => $formatter_settings,
     ])->save();
 
     return $field_config;
diff -u b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
--- b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
+++ b/core/modules/file/tests/src/Functional/Formatter/FileVideoFormatterTest.php
@@ -13,21 +13,33 @@
 
   /**
    * @covers ::viewElements
+   *
+   * @dataProvider dataProvider
    */
-  public function testRender() {
-    $field_config = $this->createMediaField('file_video', 'mp4');
+  public function testRender($tag_count, $formatter_settings) {
+
+    $field_config = $this->createMediaField('file_video', 'mp4', $formatter_settings);
 
     file_put_contents('public://file.mp4', str_repeat('t', 10));
-    $file = File::create([
+    $file1 = File::create([
+      'uri' => 'public://file.mp4',
+      'filename' => 'file.mp4',
+    ]);
+    $file1->save();
+
+    $file2 = File::create([
       'uri' => 'public://file.mp4',
       'filename' => 'file.mp4',
     ]);
-    $file->save();
+    $file2->save();
 
     $entity = EntityTest::create([
       $field_config->getName() => [
         [
-          'target_id' => $file->id(),
+          'target_id' => $file1->id(),
+        ],
+        [
+          'target_id' => $file2->id(),
         ],
       ],
     ]);
@@ -35,9 +47,25 @@
 
     $this->drupalGet($entity->toUrl());
 
-    $file_url = file_url_transform_relative(file_create_url($file->getFileUri()));
-    $this->assertSession()->elementExists('css', 'video[controls="controls"]');
-    $this->assertSession()->elementExists('css', "video > source[src='$file_url'][type='video/mp4']");
+    $file1_url = file_url_transform_relative(file_create_url($file1->getFileUri()));
+    $file2_url = file_url_transform_relative(file_create_url($file2->getFileUri()));
+
+    $this->assertSession()->elementsCount('css', 'video[controls="controls"]', $tag_count);
+    $this->assertSession()->elementExists('css', "video > source[src='$file1_url'][type='video/mp4']");
+    $this->assertSession()->elementExists('css', "video > source[src='$file2_url'][type='video/mp4']");
+  }
+
+  /**
+   * Data provider for testRender.
+   *
+   * @return array
+   *   Provided data.
+   */
+  public function dataProvider() {
+    return [
+      [2, []],
+      [1, ['multiple_file_display_type' => 'sources']],
+    ];
   }
 
 }