diff --git a/assets/js/src/newsletters/send.jsx b/assets/js/src/newsletters/send.jsx
index 1db80ac83f..199f3177b1 100644
--- a/assets/js/src/newsletters/send.jsx
+++ b/assets/js/src/newsletters/send.jsx
@@ -211,7 +211,7 @@ class NewsletterSend extends React.Component {
   saveTemplate = (response, done) => {
     const thumbnailPromise = this.getThumbnailPromise(response.meta.preview_url);
     thumbnailPromise
-      .then((thumbnail) => {
+      .then((thumbnailData) => {
         MailPoet.Ajax.post({
           api_version: window.mailpoet_api_version,
           endpoint: 'newsletterTemplates',
@@ -219,7 +219,7 @@ class NewsletterSend extends React.Component {
           data: {
             newsletter_id: response.data.id,
             name: response.data.subject,
-            thumbnail,
+            thumbnail_data: thumbnailData,
             body: JSON.stringify(response.data.body),
             categories: '["recent"]',
           },
diff --git a/lib/NewsletterTemplates/NewsletterTemplatesRepository.php b/lib/NewsletterTemplates/NewsletterTemplatesRepository.php
index 73847a4575..b7820d696c 100644
--- a/lib/NewsletterTemplates/NewsletterTemplatesRepository.php
+++ b/lib/NewsletterTemplates/NewsletterTemplatesRepository.php
@@ -52,6 +52,10 @@ class NewsletterTemplatesRepository extends Repository {
       $template->setThumbnail($data['thumbnail']);
     }
 
+    if (isset($data['thumbnail_data'])) {
+      $template->setThumbnailData($data['thumbnail_data']);
+    }
+
     if (isset($data['body'])) {
       $template->setBody(json_decode($data['body'], true));
     }
diff --git a/tests/integration/NewsletterTemplates/NewsletterTemplatesRepositoryTest.php b/tests/integration/NewsletterTemplates/NewsletterTemplatesRepositoryTest.php
index 6fc2cf8a4e..0ae4f00700 100644
--- a/tests/integration/NewsletterTemplates/NewsletterTemplatesRepositoryTest.php
+++ b/tests/integration/NewsletterTemplates/NewsletterTemplatesRepositoryTest.php
@@ -18,17 +18,21 @@ class NewsletterTemplatesRepositoryTest extends \MailPoetTest {
     $createdTemplate = $this->newsletterTemplatesRepository->createOrUpdate([
       'name' => 'Another template',
       'body' => '{"content": {}, "globalStyles": {}}',
+      'thumbnail_data' => 'data:image/gif;base64,R0lGODlhAQABAAAAACw=',
     ]);
     expect($createdTemplate->getName())->equals('Another template');
     expect($createdTemplate->getBody())->equals(['content' => [], 'globalStyles' => []]);
+    expect($createdTemplate->getThumbnailData())->equals('data:image/gif;base64,R0lGODlhAQABAAAAACw=');
 
     $updatedTemplate = $this->newsletterTemplatesRepository->createOrUpdate([
       'id' => $createdTemplate->getId(),
       'name' => 'Another template updated',
       'body' => '{"content": "changed"}',
+      'thumbnail_data' => 'data:image/gif;base64,R0lGO==',
     ]);
     expect($updatedTemplate->getName())->equals('Another template updated');
     expect($updatedTemplate->getBody())->equals(['content' => 'changed']);
+    expect($updatedTemplate->getThumbnailData())->equals('data:image/gif;base64,R0lGO==');
   }
 
   public function testItCleansRecentlySent() {