def _update_arg_tuple_for_on_drop(cls, arg_value: tuple[Var, Var]):
        """Helper to update caller-provided EventSpec args for direct use with on_drop.

        Args:
            arg_value: The arg tuple to update (if necessary).

        Returns:
            The updated arg_value tuple when arg is "files", otherwise the original arg_value.
        """
        if arg_value[0]._js_expr == "files":
            placeholders, _ = parse_args_spec(_on_drop_spec)
            placeholder = placeholders[0]
            return (arg_value[0], placeholder)
        return arg_value
Helper to update caller-provided EventSpec args for direct use with on_drop.

        Args:
            arg_value: The arg tuple to update (if necessary).

        Returns:
            The updated arg_value tuple when arg is "files", otherwise the original arg_value.
        
reflex/components/core/upload.py