Enqueue scripts and styles from upload directory

index.php

add_action( 'wp_enqueue_scripts', function() {
	$wp_upload_dir = wp_upload_dir();
	$base_url = $wp_upload_dir['baseurl'];
	$base_dir = $wp_upload_dir['basedir'];

	wp_enqueue_style(
		'howlife-style',
		sprintf( '%s/example/css/main.css', $base_url ),
		[],
		filemtime( sprintf( '%s/example/css/main.css', $base_dir ) )
	);
} );