How to perform an automatic files check?

[Thormir84]

I had installed and successfully configured the plugin but, when one or more folder is modified, inside OwnCloud there's no changes.

Inside the configuration panel, there's a section with:

Check for changes: Once every direct access

What does it mean?
Direct access where? FPT server? OwnCloud?

I have OwnCloud running inside a Docker container.
With the Portainer's built-in console, i had tryed to create this cron job:

crontab -u www-data -e
*/15 * * * * php occ files:scan --all /var/www/owncloud/cron.php

But seems it does'nt works.

Any suggestions?

NOTE: OwnCloud server 10.9.1 (stable)