Teams is using SharePoint for file storage, so you need the SPO controls/actions. The list of events generated can be found for example here: https://docs.microsoft.com/en-us/microsoft-365/compliance/search-the-audit-log-in-security-and-compl...

 

In MCAS, you can use the "Access level" controls as detailed here: https://docs.microsoft.com/en-us/cloud-app-security/data-protection-policies

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