diff --git a/backend/app/api/v1/chunks/__init__.py b/backend/app/api/v1/chunks/__init__.py
index 2c1986d..582ed87 100644
--- a/backend/app/api/v1/chunks/__init__.py
+++ b/backend/app/api/v1/chunks/__init__.py
@@ -17,7 +17,7 @@ from app.core.crud import CRUDBase
 from app.core.logging import log_success, log_failure
 from app.models.models import Chunk, File
 from app.schemas.chunk import ChunkResponse
-from app.schemas.chunk import ChunkCreateSchema
+from app.schemas.chunk import ChunkCreateSchema, ChunkUpdateSchema
 from app.services.text_splitter.splitter import get_splitter
 from markitdown import MarkItDown
 
@@ -209,7 +209,7 @@ async def list_chunks(
         limit=page_size,
         filters=filters,
         order_by="created_at",
-        descending=True
+        descending=False
     )
 
     chunk_responses = [ChunkResponse.model_validate(c) for c in chunks]
@@ -239,7 +239,7 @@ async def get_chunk(
 async def update_chunk(
     project_id: UUID,
     chunk_id: UUID,
-    chunk: ChunkCreateSchema,
+    chunk: ChunkUpdateSchema,
     db: AsyncSession = Depends(get_db)
 ):
     """Update chunk"""
diff --git a/backend/app/api/v1/files/__init__.py b/backend/app/api/v1/files/__init__.py
index d8aa93b..3791243 100644
--- a/backend/app/api/v1/files/__init__.py
+++ b/backend/app/api/v1/files/__init__.py
@@ -158,7 +158,7 @@ async def upload_file(
                         # txt, md 等直接读取
                         text_content = file_path_obj.read_text(encoding='utf-8')
 
-                    # 保存到 ready 目录
+                    # 保存到 ready 目录，使用 {uuid}.md 格式
                     ready_dir = get_project_ready_dir(str(project_id_val))
                     ready_filename = f"{file_id}.md"
                     ready_path = ready_dir / ready_filename