diff --git a/src/Resource/BatchSending.php b/src/Resource/BatchSending.php
index be966b7..1f8d9a9 100644
--- a/src/Resource/BatchSending.php
+++ b/src/Resource/BatchSending.php
@@ -16,6 +16,8 @@ class BatchSending extends BaseResource
 
     public ?string $envelopeTemplateId;
 
+    public ?File $file;
+
     public int $itemsWaitingCount;
 
     public int $itemsSuccessCount;