Change where Drupal 8 sync directory lives: https://www.drupal.org/docs/8/configuration-management/changing-the-sto…
put
$config_directories[CONFIG_SYNC_DIRECTORY] = 'sites/default/sync';
at the bottom of the settings.php file, otherwise defaults to the sites/files directory.
https://drupal.stackexchange.com/questions/244083/what-is-the-use-of-sy…
drush config-export
drush config-import