Adding a custom logo to a WordPress theme's starter content.

starter-content-custom-logo.php

<?php
/**
 * Theme defaults and support for WordPress features.
 */
function prefix_setup() {

	/*
	 * Define starter content for the theme.
	 * See: https://make.wordpress.org/core/2016/11/30/starter-content-for-themes-in-4-7/
	 */
	$starter_content = array(
		'attachments' => array(
			'logo' => array(
				'post_title' => _x( 'Logo', 'Theme starter content', 'prefix' ),
				'file' => 'inc/customizer/images/logo.png',
			),
		),

		'theme_mods' => array(
			'custom_logo' => '{{logo}}',
		),
	);

	/**
	 * Filters the theme's array of starter content.
	 *
	 * @param array $starter_content Array of starter content.
	 */
	$starter_content = apply_filters( 'prefix_starter_content', $starter_content );

	add_theme_support( 'starter-content', $starter_content );

}

add_action( 'after_setup_theme', 'prefix_setup' );

Hello RichTabor,
Is it still works or supported? Unfortunately, it does not work (not fresh installation). Can you reccomend something for an existing site?
Thank you!