SharePoint sites come with an allocated storage quota. SharePoint site administrators will receive a notification when a site reaches 85% usage.
To increase your storage, contact EASI SharePoint Support.
Note: only site owners or administrators can perform this. For assistance, contact a site owner/administrator or EASI SharePoint Support.
Follow the steps in this video.
NOTE: the first stage Recycle bin also counts against your storage quota.
From the Gear icon > Site Contents, select Site Usage from the grey menu. This page provides a breakdown of views and visits, traffic patterns, popular platforms, and popular items on the site.
It provides stats for the past 90 days with an option to download an Excel report.
To examine specific pages, visit them and select Analytics at the top.