diff --git a/api/apps/document_app.py b/api/apps/document_app.py
index fa12af9eb..7d97bfe25 100644
--- a/api/apps/document_app.py
+++ b/api/apps/document_app.py
@@ -520,12 +520,12 @@ async def get(doc_id):
 
 @manager.route("/download/<attachment_id>", methods=["GET"])  # noqa: F821
 @login_required
-def download_attachment(attachment_id):
+async def download_attachment(attachment_id):
     try:
         ext = request.args.get("ext", "markdown")
         data = settings.STORAGE_IMPL.get(current_user.id, attachment_id)
         # data = settings.STORAGE_IMPL.get("eb500d50bb0411f0907561d2782adda5", attachment_id)
-        response = make_response(data)
+        response = await make_response(data)
         response.headers.set("Content-Type", CONTENT_TYPE_MAP.get(ext, f"application/{ext}"))
 
         return response
diff --git a/api/apps/sdk/doc.py b/api/apps/sdk/doc.py
index ad0882eee..3a82eaa54 100644
--- a/api/apps/sdk/doc.py
+++ b/api/apps/sdk/doc.py
@@ -361,7 +361,7 @@ async def update_doc(tenant_id, dataset_id, document_id):
 
 @manager.route("/datasets/<dataset_id>/documents/<document_id>", methods=["GET"])  # noqa: F821
 @token_required
-def download(tenant_id, dataset_id, document_id):
+async def download(tenant_id, dataset_id, document_id):
     """
     Download a document from a dataset.
     ---
@@ -411,7 +411,7 @@ def download(tenant_id, dataset_id, document_id):
         return construct_json_result(message="This file is empty.", code=RetCode.DATA_ERROR)
     file = BytesIO(file_stream)
     # Use send_file with a proper filename and MIME type
-    return send_file(
+    return await send_file(
         file,
         as_attachment=True,
         download_name=doc[0].name,