Getting Error on DOM PDF

Hi, I have installed DOM PDF and it is working fine if I store my files directly into the public dir, But I create a sub dir in public and then try to upload a file and make a pdf getting an error file_put_contents(/var/www/html/aqib/public/images): Failed to open stream: Is a directory

My Code

$pdf = Pdf::loadView('pdf',['photo'=> $fileNameToStore.time().'.'.$extension])->save(public_path('images'),$fileNameToStore.time().'.pdf');