Files are a treasure trove of sensitive and important information. Use FileEvent and FileEventStore, now generally available, to track file previews, uploads, and downloads from the UI and API. And because file events support transaction security policies, you can take steps to proactively control how users interact with specific files.
Where: This change applies to Lightning Experience and Salesforce Classic in Enterprise, Performance, Unlimited, and Developer editions where Event Monitoring is enabled.
Who: This change is available to customers who purchased Salesforce Shield or Salesforce Event Monitoring add-on subscriptions.
Track File Usage in Near Real-Time with FileEvent (Generally Available) (salesforce.com)