Required depends on radio button

Question

I try to have a required value depends on radio button

$builder
            ->add('radio',ChoiceType::class,[
                'label' => 'My radio button',
                'choices'=>[
                    'Yes'=>'Yes',
                    "No"=>"No"
                ],
                "expanded"=>true,
                "multiple"=>false,
                'required' => true,
                'placeholder' => false
            ])
            ->add('file input', FileInputType::class, [
                'label' => 'put your file',
                'mapped' => false,
                'required' => true or false // depends on radio button
            ])

But i can't find how to do this, i'm a beginner in symfony. I use Symfony 5

Please if you have an idea i'm listening