Metabox Data not being saved [closed]

If that is all of your code, you’re missing a save_post action to save the data. Refer to the code sample provided on add_meta_box.

add_action( 'save_post', 'save_my_meta_box_data' );

function save_my_meta_box_data( $post_id ){
    // make sure it's not an autosave
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
        return;

    // verify your nonce
    if ( !wp_verify_nonce( $_POST['my_noncename'], 'my-nonce' ) )
        return;

    // check post type, permissions
    // validate your $_POST data
    // update_post_meta();
}

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