here is my custom post type and category:

//Register nav
register_nav_menus( array(
    'main_nav' => 'Main navigation'
) );

//Custom post types
add_action( 'init', 'create_post_type' );
function create_post_type() {
    register_post_type( 'assets',
            'labels' => array(
                'name' => __( 'Assets' ),
                'show_in_nav_menus' => true,
                'show_in_menu' => true,
                'singular_name' => __( 'Asset' )
        'public' => true,
        'has_archive' => true,

//Custom post type taxonomy/category
add_action( 'init', 'build_taxonomies', 0 );
function build_taxonomies() {
    register_taxonomy( 'categories', 'assets',
            'hierarchical' => true,
            'label' => 'Categories',
            'query_var' => true,
            'rewrite' => true

Even though I have 'show_in_nav_menus' turned on, it still won't show. Is there something wrong with my code?

It seems to work fine otherwise. Thanks


Ugh. Fixed.

You have to show the 2nd category box in screen options, I could only see the default post categories. I'm glad I spent 40 mins trying new bits of code for that.


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