Update app.py

app.py

@@ -71,10 +71,12 @@ async def convert_file(
             detail="Invalid color format. Use 6-character hex code (e.g., '5FFFDF')"
         )
     
-    with tempfile.NamedTemporaryFile(delete=False, suffix='.xlsx') as temp_input:
-        content = await file.read()
-        temp_input.write(content)
-        temp_input_path = temp_input.name
+    original_name = Path(file.filename).stem
+    temp_dir = tempfile.mkdtemp()
+    temp_input_path = os.path.join(temp_dir, f"{original_name}.xlsx")
+    
+    with open(temp_input_path, "wb") as f:
+        f.write(await file.read())
 
     output_filename = file.filename.replace('.xlsx', '_converted.docx')
     temp_output_path = tempfile.mktemp(suffix='.docx')