Media custom fields data not persisted in custom tables

This is generated PHP as an example. NOTE: I am not registering taxonomy in php, I am using Meta Box web interface for all fields.

<?php
add_action( 'init', 'your_prefix_register_taxonomy' );
function your_prefix_register_taxonomy() {
    $labels = [
        'name'                       => esc_html__( 'Sources', 'your-textdomain' ),
        'singular_name'              => esc_html__( 'Source', 'your-textdomain' ),
        'menu_name'                  => esc_html__( 'Sources', 'your-textdomain' ),
        'search_items'               => esc_html__( 'Search Sources', 'your-textdomain' ),
        'popular_items'              => esc_html__( 'Popular Sources', 'your-textdomain' ),
        'all_items'                  => esc_html__( 'All Sources', 'your-textdomain' ),
        'parent_item'                => esc_html__( 'Parent Source', 'your-textdomain' ),
        'parent_item_colon'          => esc_html__( 'Parent Source', 'your-textdomain' ),
        'edit_item'                  => esc_html__( 'Edit Source', 'your-textdomain' ),
        'view_item'                  => esc_html__( 'View Source', 'your-textdomain' ),
        'update_item'                => esc_html__( 'Update Source', 'your-textdomain' ),
        'add_new_item'               => esc_html__( 'Add new source', 'your-textdomain' ),
        'new_item_name'              => esc_html__( 'New source name', 'your-textdomain' ),
        'separate_items_with_commas' => esc_html__( 'Separate sources with commas', 'your-textdomain' ),
        'add_or_remove_items'        => esc_html__( 'Add or remove sources', 'your-textdomain' ),
        'choose_from_most_used'      => esc_html__( 'Choose most used sources', 'your-textdomain' ),
        'not_found'                  => esc_html__( 'No sources found', 'your-textdomain' ),
        'no_terms'                   => esc_html__( 'No Sources', 'your-textdomain' ),
        'filter_by_item'             => esc_html__( 'Filter by source', 'your-textdomain' ),
        'items_list_navigation'      => esc_html__( 'Sources list pagination', 'your-textdomain' ),
        'items_list'                 => esc_html__( 'Sources list', 'your-textdomain' ),
        'most_used'                  => esc_html__( 'Most Used', 'your-textdomain' ),
        'back_to_items'              => esc_html__( 'Back to sources', 'your-textdomain' ),
    ];
    $args = [
        'label'              => esc_html__( 'Sources', 'your-textdomain' ),
        'labels'             => $labels,
        'description'        => '',
        'public'             => true,
        'publicly_queryable' => true,
        'hierarchical'       => false,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'show_in_nav_menus'  => true,
        'meta_box_cb'        => true,
        'show_in_rest'       => true,
        'show_tagcloud'      => true,
        'show_in_quick_edit' => true,
        'show_admin_column'  => false,
        'query_var'          => true,
        'sort'               => false,
        'rest_base'          => '',
        'rewrite'            => [
            'slug'         => 'source',
            'with_front'   => false,
            'hierarchical' => false,
        ],
    ];
    register_taxonomy( 'vob-source', [], $args );
}

Hi Long,

I have used Meta Box web UI to create tables and it all looks correct in DB. Also, similar fields but added to a custom post type work as expected.

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'        => __( 'VoB Media Source', 'your-text-domain' ),
        'id'           => 'vob-source-media',
        'post_types'   => ['attachment'],
        'media_modal'  => true,
        'storage_type' => 'custom_table',
        'table'        => 'wp_custom_vob_source_media',
        'fields'       => [
            [
                'name'              => __( 'VoB Source Name', 'your-text-domain' ),
                'id'                => $prefix . 'vob_source_name',
                'type'              => 'taxonomy_advanced',
                'label_description' => __( 'Name of the publisher or web-site.', 'your-text-domain' ),
                'taxonomy'          => ['vob-source'],
                'field_type'        => 'select',
                'add_new'           => true,
                'required'          => true,
            ],
            [
                'name'              => __( 'VoB Source URL', 'your-text-domain' ),
                'id'                => $prefix . 'vob_source_url',
                'type'              => 'url',
                'label_description' => __( 'Link to content source.', 'your-text-domain' ),
                'placeholder'       => __( 'Add source URL', 'your-text-domain' ),
                'required'          => true,
            ],
        ],
        'validation'   => [
            'rules' => [
                $prefix . 'vob_source_name' => [
                    'required' => true,
                ],
                $prefix . 'vob_source_url'  => [
                    'required' => true,
                    'url'      => true,
                ],
            ],
        ],
    ];

    return $meta_boxes;
}

Your SQL query has been executed successfully.

DESCRIBE <code>wp_custom_vob_source_media</code>

ID  bigint(20) unsigned NO  PRI 
    NULL
        
vob_source_name text    YES     
    NULL
        
vob_source_url  text    YES     
    NULL
        

Thanks, Long! I have also come to that conclusion.

We would appreciate for a prompt fix. We have been evaluating ToolSet and Meta Box for our use cases and ability to add custom fields to Media Modal was one of the selling point as it saves our editors from additional clicks and is more straightforward.