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My CPT is created using a plugin so i cannot edit the supports parameter to add support for custom fields.

I tried using this code however it doesn't work either

add_action('init', 'custom_child_init');
function custom_child_init() {
    add_theme_support( 'custom-fields' );
}

How do i enable the custom field meta box on the Edit Page screen for single custom post types?

2

Try with this. just change CPT with your post type.

function wpcodex_add_excerpt_support_for_cpt() {
    add_post_type_support( 'CPT', 'custom-fields' );
}
add_action( 'init', 'wpcodex_add_excerpt_support_for_cpt' );

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