When you delete a bunch of files at once it can take our system a
little while to catch up. If you notice a discrepancy, wait a few
minutes and navigate to "Manage > Usage", then click the
'refresh' button towards the top-right of the page. You should
notice a reduction in your usage stats when the page updates. This
same refresh process occurs automatically several times a day.
As a side note; you can configure the app to automatically clean up
storage for you. Navigate to 'Manage > Account' (https://digitalpigeon.com/app/settings/account),
under the section for 'Auto expire' and 'Archive on expiry' you can
configured the app to automatically free up space for you (sending
you a notification before hand).