diff --git a/app/Http/Controllers/MainController.php b/app/Http/Controllers/MainController.php
index 646c482..39a63f2 100644
--- a/app/Http/Controllers/MainController.php
+++ b/app/Http/Controllers/MainController.php
@@ -76,15 +76,16 @@ class MainController extends Controller {
 
             if (!empty($res)) {
                 if ($images = data_get($res, 'images')) {
-                    $images = array_filter($images, function($item) {
-                        return !empty($item);
-                    });
-
                     foreach ($images as $key => $image) {
+                        if (empty($image)) {
+                            continue;
+                        }
+
                         $file = $this->downloadFile($image);
 
                         $attachment = $book->attach($file, [
-                            'key' => $key
+                            'key' => $key,
+                            'group' => 'images'
                         ]);
 
                         $attachment->filename = $key . '.jpg';