How to insert HTML before post featured image?

Hi,

You can use this action hook customify/single/field_title/after to add some code after the post title. See my sample code

add_action( 'customify/single/field_title/after', 'add_code_after_post_title', 20, 4 );

function add_code_after_post_title( $post, $fields, $args, $post_entry_object ) {
	echo "Text after the post title";
}

Reference https://github.com/PressMaximum/customify/blob/master/inc/blog/class-post-entry.php#L723.

That did it. Thanks!