Update app.py

app.py

@@ -1077,7 +1077,7 @@ def send_whatsjet_message(phone_number: str, message: str, media_type: str = Non
         if isinstance(media_path, str) and media_path.startswith("http"):
             payload = {
                 "phone_number": phone_number,
-                "message_body": message,
+                "caption": message,  # Use 'caption' instead of 'message_body'
                 "media_type": media_type,
                 "media_url": media_path,
                 "media_filename": filename or os.path.basename(media_path)