Hi,
You may need to clear the cache only – if the file method is chosen, then the stylesheets are definitely enqueued on all of the website pages. The issue is more likely a cache or a missing wp_head or wp_footer section. You should also check if the stylesheet files are generated in the wp-content/cache/asp/ folder. If that folder does not exist, then try creating it manually, then saving the search options again to refresh.
You can however forcefully enqueue the plugin styles via:
\WPDRMS\ASP\Asset\Css\Manager::_o()->enqueue( true );
..call, but this is actually executed anyways if the file method is used.
You can use this like:
add_action('wp_enqueue_scripts', function(){
\WPDRMS\ASP\Asset\Css\Manager::_o()->enqueue( true );
});But I strongly recommend checking the file wp-content/cache/asp/ folder first if it exists.