I followed all the steps mentioned in the link: https://www.drupal.org/node/2598914 and https://www.drupal.org/docs/8/theming/twig/debugging-twig-templates
to enable debugging of the twig and stop caching. But there is no success. I have not used drush cr to clear the cache, but I have deleted using http: //yoursite/core/rebuild.php.
Also, in my browser show HTML comments is enabled.
But still, I can not see twig comments on my site and also my site is still caching.