diff --git a/app/Services/FileManagerService.php b/app/Services/FileManagerService.php
index f6441dda..87cfa4e6 100644
--- a/app/Services/FileManagerService.php
+++ b/app/Services/FileManagerService.php
@@ -419,7 +419,7 @@ class FileManagerService
             $this->helper->check_user_storage_capacity($user_id, $file_size, $temp_filename);
 
             // Create thumbnail
-            $thumbnail = self::get_image_thumbnail('chunks/' . $temp_filename, $disk_file_name, $user_id);
+            $thumbnail = $this->helper->get_image_thumbnail('chunks/' . $temp_filename, $disk_file_name, $user_id);
 
             // Move finished file from chunk to file-manager directory
             $disk_local->move('chunks/' . $temp_filename, "files/$user_id/$disk_file_name");
@@ -486,44 +486,4 @@ class FileManagerService
             ]);
         }
     }
-
-    /**
-     * Create thumbnail for images
-     *
-     * @param string $file_path
-     * @param string $filename
-     * @param string $user_id
-     * @param $file
-     * @return string|null
-     */
-    private function get_image_thumbnail(string $file_path, string $filename, string $user_id)
-    {
-        $local_disk = Storage::disk('local');
-
-        // Create thumbnail from image
-        if (in_array($local_disk->mimeType($file_path), ['image/gif', 'image/jpeg', 'image/jpg', 'image/png', 'image/webp'])) {
-
-            // Get thumbnail name
-            $thumbnail = 'thumbnail-' . $filename;
-
-            // Create intervention image
-            $image = Image::make($local_disk->path($file_path))->orientate();
-
-            // Resize image
-            $image->resize(512, null, function ($constraint) {
-                $constraint->aspectRatio();
-            })->stream();
-
-            // Store thumbnail to disk
-            $local_disk->put("files/$user_id/$thumbnail", $image);
-        }
-
-        // Return thumbnail as svg file
-        if ($local_disk->mimeType($file_path) === 'image/svg+xml') {
-
-            $thumbnail = $filename;
-        }
-
-        return $thumbnail ?? null;
-    }
 }
\ No newline at end of file
diff --git a/app/Services/HelperService.php b/app/Services/HelperService.php
index 3ce8c462..df1bfa50 100644
--- a/app/Services/HelperService.php
+++ b/app/Services/HelperService.php
@@ -9,6 +9,7 @@ use DB;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\Storage;
+use Intervention\Image\ImageManagerStatic as Image;
 use Symfony\Component\HttpKernel\Exception\HttpException;
 
 class HelperService
@@ -99,7 +100,7 @@ class HelperService
      * @param string $filename
      * @param string|null $thumbnail
      */
-    function move_to_external_storage(string $filename, ?string $thumbnail): void
+    function move_to_external_storage($filename, $thumbnail = null): void
     {
         $disk_local = Storage::disk('local');
 
@@ -157,4 +158,44 @@ class HelperService
             $disk_local->delete('files/' . $file);
         }
     }
+
+    /**
+     * Create image thumbnail from gif, jpeg, jpg, png, webp or svg
+     *
+     * @param string $file_path
+     * @param string $filename
+     * @param string $user_id
+     * @return string|null
+     */
+    function get_image_thumbnail($file_path, $filename, $user_id)
+    {
+        $local_disk = Storage::disk('local');
+
+        // Create thumbnail from image
+        if (in_array($local_disk->mimeType($file_path), ['image/gif', 'image/jpeg', 'image/jpg', 'image/png', 'image/webp'])) {
+
+            // Get thumbnail name
+            $thumbnail = "thumbnail-$filename";
+
+            // Create intervention image
+            $image = Image::make($local_disk->path($file_path))
+                ->orientate();
+
+            // Resize image
+            $image->resize(512, null, function ($constraint) {
+                $constraint->aspectRatio();
+            })->stream();
+
+            // Store thumbnail to disk
+            $local_disk->put("files/$user_id/$thumbnail", $image);
+        }
+
+        // Return thumbnail as svg file
+        if ($local_disk->mimeType($file_path) === 'image/svg+xml') {
+
+            $thumbnail = $filename;
+        }
+
+        return $thumbnail ?? null;
+    }
 }
\ No newline at end of file