diff --git a/app/Admin/Controllers/Train/BookController.php b/app/Admin/Controllers/Train/BookController.php
index b52e919..201d168 100644
--- a/app/Admin/Controllers/Train/BookController.php
+++ b/app/Admin/Controllers/Train/BookController.php
@@ -71,6 +71,7 @@ class BookController extends AdminController
             Components::make()->fuEditorControl('content', __('train_book.content'))->visibleOn('${type == '.BookType::Text->value.'}'),
             amisMake()->FileControl()->name('video')->label(__('train_book.video'))
                 ->receiver(admin_url('upload_file').'?full-url=1')
+                ->chunkSize(20*1024*1024)
                 ->startChunkApi(admin_url('start_chunk_upload_file'))
                 ->chunkApi(admin_url('save_chunk_upload_file'))
                 ->finishChunkApi(admin_url('finish_chunk_upload_file'))