The extension groups all quota related fields in a tab Quota settings in the File Storage records. Quota configuration is done per storage.
Enabling Quota for a Storage¶
To enable Quotas for a storage, you must set up a quota , a hard limit  and optionally a threshold (defaults to 75 %)  and email recipient(s). Multiple recipient addresses are separated by comma (,) .
The example above defines a soft quota of 10 MB  and a hard limit of 15 MB . Hard limit values must be equal to or greater than the soft quota values. The notification threshold value  defines the limit where the utilization check starts sending email notifications (if recipients have been specified and the Scheduler task has been configured. See Configuration for details).