Feature image option won't show in portfolio

I am making a wordpress theme But the problem is i can not enable feature image option in Portfolio I have added the following code in the function.php add_theme_support( "post-thumbnails", array('portfolio', 'post'));

This code is working for posts but not for portfolio

is it because of any of these plugins that i am using

Advanced Custom Fields Custom Post Type UI Akismet

enter image description here

via Chebli Mohamed