fix(core): drag and drop files into doc (#6630)

close #6625

packages/frontend/core/src/components/blocksuite/block-suite-editor/specs.ts

@@ -22,6 +22,7 @@ class CustomAttachmentService extends AttachmentService {
     // blocksuite default max file size is 10MB, we override it to 2GB
     // but the real place to limit blob size is CloudQuotaModal / LocalQuotaModal
     this.maxFileSize = bytes.parse('2GB');
+    super.mounted();
   }
 }