functions.php

<?php

add_action('blocksy:pro:content-blocks:pre-output', function ($id) {
	if (is_admin() || ! $id) {
		return;
	}

	$maybe_file_path = wp_upload_dir()[
		'basedir'
	] . '/cwicly/css/cc-post-' . $id . '.css';

	if (file_exists($maybe_file_path)) {
		wp_enqueue_style(
			'cc-post-' . $id . '',
			wp_upload_dir()['baseurl'] . '/cwicly/css/cc-post-' . $id . '.css',
			[],
			filemtime($maybe_file_path)
		);
	}
});