add

app.py

@@ -74,7 +74,7 @@ from PIL import Image
 import io
 import docx2txt
 from fastapi.responses import StreamingResponse
-
+from io import BytesIO
 
 # Configuration du logging
 logging.basicConfig(level=logging.INFO)
@@ -197,7 +197,8 @@ async def generate_viz(file: UploadFile = File(...), query: str = Form(...)):
         if query not in VALID_PLOTS:
             return JSONResponse(content={"error": f"Type de graphique invalide. Choisissez parmi : {', '.join(VALID_PLOTS)}"}, status_code=400)
 
-        df = pd.read_excel(file.file)
+        file_content = await file.read()  # <- on lit tout
+        df = pd.read_excel(BytesIO(file_content))  # <- on lit depuis un buffer
         numeric_cols = df.select_dtypes(include=["number"]).columns
 
         if len(numeric_cols) < 1: