diff --git a/core/modules/media/src/Entity/Media.php b/core/modules/media/src/Entity/Media.php
index 047922fdca..e8dc880f8d 100644
--- a/core/modules/media/src/Entity/Media.php
+++ b/core/modules/media/src/Entity/Media.php
@@ -189,13 +189,15 @@ protected function updateThumbnail($from_queue = FALSE) {
   }
 
   /**
-   * Update the queued thumbnail for the media item.
+   * Updates the queued thumbnail for the media item.
    *
    * @return \Drupal\media\MediaInterface
    *   The updated media item.
    *
    * @internal
-   * @todo If the need arises in contrib, consider making this a public API, by adding an interface that extends MediaInterface.
+   *
+   * @todo If the need arises in contrib, consider making this a public API,
+   *   by adding an interface that extends MediaInterface.
    */
   public function updateQueuedThumbnail() {
     $this->updateThumbnail(TRUE);
diff --git a/core/modules/media/tests/modules/media_test_source/config/schema/media_test_source.schema.yml b/core/modules/media/tests/modules/media_test_source/config/schema/media_test_source.schema.yml
index 25d6bfbcdf..089aeac35f 100644
--- a/core/modules/media/tests/modules/media_test_source/config/schema/media_test_source.schema.yml
+++ b/core/modules/media/tests/modules/media_test_source/config/schema/media_test_source.schema.yml
@@ -6,6 +6,10 @@ media.source.test:
       type: string
       label: 'Test config value'
 
+media.source.test_translation:
+  type: media.source.test
+  label: 'Test media source with translations'
+
 media.source.test_constraints:
   type: media.source.test
   label: 'Test media source with constraints configuration'
diff --git a/core/modules/media/tests/modules/media_test_source/src/Plugin/media/Source/TestTranslation.php b/core/modules/media/tests/modules/media_test_source/src/Plugin/media/Source/TestTranslation.php
new file mode 100644
index 0000000000..2416ad38b9
--- /dev/null
+++ b/core/modules/media/tests/modules/media_test_source/src/Plugin/media/Source/TestTranslation.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\media_test_source\Plugin\media\Source;
+
+use Drupal\media\MediaInterface;
+
+/**
+ * Provides test media source.
+ *
+ * @MediaSource(
+ *   id = "test_translation",
+ *   label = @Translation("Test source with translations"),
+ *   description = @Translation("Test media source with translations."),
+ *   allowed_field_types = {"string"},
+ * )
+ */
+class TestTranslation extends Test {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMetadata(MediaInterface $media, $attribute_name) {
+    if ($attribute_name == 'thumbnail_uri') {
+      return 'public://' . $media->language()->getId() . '.png';
+    }
+
+    return parent::getMetadata($media, $attribute_name);
+  }
+
+}
diff --git a/core/modules/media/tests/src/Kernel/BasicCreationTest.php b/core/modules/media/tests/src/Kernel/MediaCreationTest.php
similarity index 98%
rename from core/modules/media/tests/src/Kernel/BasicCreationTest.php
rename to core/modules/media/tests/src/Kernel/MediaCreationTest.php
index 8748caca73..123470341b 100644
--- a/core/modules/media/tests/src/Kernel/BasicCreationTest.php
+++ b/core/modules/media/tests/src/Kernel/MediaCreationTest.php
@@ -12,7 +12,7 @@
  *
  * @group media
  */
-class BasicCreationTest extends MediaKernelTestBase {
+class MediaCreationTest extends MediaKernelTestBase {
 
   /**
    * Tests creating a media type programmatically.
diff --git a/core/modules/media/tests/src/Kernel/MediaKernelTestBase.php b/core/modules/media/tests/src/Kernel/MediaKernelTestBase.php
index eb644c0abd..0daec876af 100644
--- a/core/modules/media/tests/src/Kernel/MediaKernelTestBase.php
+++ b/core/modules/media/tests/src/Kernel/MediaKernelTestBase.php
@@ -52,40 +52,40 @@ protected function setUp() {
     $this->installConfig(['field', 'system', 'image', 'file', 'media']);
 
     // Create a test media type.
-    $id = strtolower($this->randomMachineName());
-    $this->testMediaType = MediaType::create([
-      'id' => $id,
-      'label' => $id,
-      'source' => 'test',
-      'new_revision' => FALSE,
-    ]);
-    $this->testMediaType->save();
-    $source_field = $this->testMediaType->getSource()->createSourceField($this->testMediaType);
-    $source_field->getFieldStorageDefinition()->save();
-    $source_field->save();
-    $this->testMediaType->set('source_configuration', [
-      'source_field' => $source_field->getName(),
-    ])->save();
-
+    $this->testMediaType = $this->createMediaType('test');
     // Create a test media type with constraints.
+    $this->testConstraintsMediaType = $this->createMediaType('test_constraints');
+  }
+
+  /**
+   * Create a media type for a source plugin.
+   *
+   * @param string $media_source_name
+   *   The name of the media source.
+   *
+   * @return \Drupal\media\MediaTypeInterface
+   *   A media type.
+   */
+  protected function createMediaType($media_source_name) {
     $id = strtolower($this->randomMachineName());
-    $this->testConstraintsMediaType = MediaType::create([
+    $media_type = MediaType::create([
       'id' => $id,
       'label' => $id,
-      'source' => 'test_constraints',
+      'source' => $media_source_name,
       'new_revision' => FALSE,
     ]);
-    $this->testConstraintsMediaType->save();
-    $source_field = $this->testConstraintsMediaType->getSource()->createSourceField($this->testConstraintsMediaType);
+    $media_type->save();
+    $source_field = $media_type->getSource()->createSourceField($media_type);
     // The media type form creates a source field if it does not exist yet. The
     // same must be done in a kernel test, since it does not use that form.
     // @see \Drupal\media\MediaTypeForm::save()
     $source_field->getFieldStorageDefinition()->save();
     // The source field storage has been created, now the field can be saved.
     $source_field->save();
-    $this->testConstraintsMediaType->set('source_configuration', [
+    $media_type->set('source_configuration', [
       'source_field' => $source_field->getName(),
     ])->save();
+    return $media_type;
   }
 
 }
diff --git a/core/modules/media/tests/src/Kernel/TokensTest.php b/core/modules/media/tests/src/Kernel/MediaTokensTest.php
similarity index 96%
rename from core/modules/media/tests/src/Kernel/TokensTest.php
rename to core/modules/media/tests/src/Kernel/MediaTokensTest.php
index 9dea30dad9..a7222c0074 100644
--- a/core/modules/media/tests/src/Kernel/TokensTest.php
+++ b/core/modules/media/tests/src/Kernel/MediaTokensTest.php
@@ -12,7 +12,7 @@
  *
  * @group media
  */
-class TokensTest extends EntityKernelTestBase {
+class MediaTokensTest extends EntityKernelTestBase {
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/media/tests/src/Kernel/MediaTranslationTest.php b/core/modules/media/tests/src/Kernel/MediaTranslationTest.php
new file mode 100644
index 0000000000..5d1a400338
--- /dev/null
+++ b/core/modules/media/tests/src/Kernel/MediaTranslationTest.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace Drupal\Tests\media\Kernel;
+
+use Drupal\Component\Render\FormattableMarkup;
+use Drupal\language\Entity\ConfigurableLanguage;
+
+/**
+ * Tests multilanguage fields logic.
+ *
+ * @group media
+ */
+class MediaTranslationTest extends MediaKernelTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['language'];
+
+  /**
+   * The test media translation type.
+   *
+   * @var \Drupal\media\MediaTypeInterface
+   */
+  protected $testTranslationMediaType;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->installConfig(['language']);
+
+    // Create a test media type for translations.
+    $this->testTranslationMediaType = $this->createMediaType('test_translation');
+
+    for ($i = 0; $i < 3; ++$i) {
+      $language_id = 'l' . $i;
+      ConfigurableLanguage::create([
+        'id' => $language_id,
+        'label' => $this->randomString(),
+      ])->save();
+      file_put_contents('public://' . $language_id . '.png', '');
+    }
+  }
+
+  /**
+   * Test translatable fields storage/retrieval.
+   */
+  public function testTranslatableFieldSaveLoad() {
+    /** @var \Drupal\Core\Entity\EntityTypeInterface $entity_type */
+    $entity_type = $this->container->get('entity_type.manager')->getDefinition('media');
+    $this->assertTrue($entity_type->isTranslatable(), 'Media is translatable.');
+
+    // Prepare the field translations.
+    $source_field_definition = $this->testTranslationMediaType->getSource()->getSourceFieldDefinition($this->testTranslationMediaType);
+    $source_field_storage = $source_field_definition->getFieldStorageDefinition();
+    /** @var \Drupal\Core\Entity\Sql\SqlContentEntityStorage $media_storage */
+    $media_storage = $this->container->get('entity_type.manager')->getStorage('media');
+    /** @var \Drupal\media\Entity\Media $media */
+    $media = $media_storage->create([
+      'bundle' => $this->testTranslationMediaType->id(),
+      'name' => 'Unnamed',
+    ]);
+
+    $field_translations = [];
+    $available_langcodes = array_keys($this->container->get('language_manager')->getLanguages());
+    $media->set('langcode', reset($available_langcodes));
+    foreach ($available_langcodes as $langcode) {
+      $values = [];
+      for ($i = 0; $i < $source_field_storage->getCardinality(); $i++) {
+        $values[$i]['value'] = $this->randomString();
+      }
+      $field_translations[$langcode] = $values;
+      $translation = $media->hasTranslation($langcode) ? $media->getTranslation($langcode) : $media->addTranslation($langcode);
+      $translation->{$source_field_definition->getName()}->setValue($field_translations[$langcode]);
+    }
+
+    // Save and reload the field translations.
+    $media->save();
+    $media_storage->resetCache();
+    $media = $media_storage->load($media->id());
+
+    // Check if the correct source field values were saved/loaded.
+    foreach ($field_translations as $langcode => $items) {
+      /** @var \Drupal\media\MediaInterface $media_translation */
+      $media_translation = $media->getTranslation($langcode);
+      $result = TRUE;
+      foreach ($items as $delta => $item) {
+        $result = $result && $item['value'] == $media_translation->{$source_field_definition->getName()}[$delta]->value;
+      }
+      $this->assertTrue($result, new FormattableMarkup('%language translation field value not correct.', ['%language' => $langcode]));
+      $this->assertEquals('public://' . $langcode . '.png', $media_translation->getSource()->getMetadata($media_translation, 'thumbnail_uri'), new FormattableMarkup('%language translation thumbnail metadata attribute is not correct.', ['%language' => $langcode]));
+    }
+  }
+
+}