Untitled prevents post-thumbnail support from loading for Custom Post Types

Howdy @sunilwilliams!

You can do this in your child theme by copying the existing untitled_setup() function from the parent theme into your child theme’s functions.php, then changing whatever you like for your child theme’s purposes:

function untitled_setup() {

	/**
	 * Make theme available for translation
	 * Translations can be filed in the /languages/ directory
	 * If you're building a theme based on untitled, use a find and replace
	 * to change 'untitled' to the name of your theme in all the template files
	 */
	load_theme_textdomain( 'untitled', get_template_directory() . '/languages' );

	/**
	 * Add default posts and comments RSS feed links to head
	 */
	add_theme_support( 'automatic-feed-links' );

	/**
	 * Enable support for Post Thumbnails
	 */
	add_theme_support( 'post-thumbnails', array( 'post', 'page', 'custom-post-type' ) );
	set_post_thumbnail_size( 150, 150 );
	add_image_size( 'slider-img', 1440, 400, true );
	add_image_size( 'content-img', 300, 168, true );
	add_image_size( 'thumbnail-img', 62, 62, true );
	add_image_size( 'feat-img', 1000 );

	/**
	 * This theme uses wp_nav_menu() in one location.
	 */
	register_nav_menus( array(
		'primary' => __( 'Primary Menu', 'untitled' ),
	) );

	/**
	 * Enable support for Post Formats
	 */
	add_theme_support( 'post-formats', array( 'aside', 'image', 'video', 'quote', 'link' ) );
}