The Files panel will show you metrics on files read or edited in SharePoint, and how Sync (to OneDrive for Business) and Share (both internal and external) are being used:
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SharePoint Activity by Files and Pages Charts
Any dramatic increase in reads, syncs, or external sharing is likely to attract the attention of security conscious system admins. The previous charts are interesting because they show unusual spikes in the number of SharePoint documents being viewed or edited.
The earlier chart prompted ...
