Jun 11 2019 12:40 AM
Jun 11 2019 12:51 AM
Go to admin center - reports - OneDrive! There's 180 days history there but it can take 24-48 hours til it shows
Also you can use the audit log in the security and compliance center to search for lot's of different kinds of file and sharing activity!
Jun 11 2019 11:08 AM
What exactly do you understand by "live reports for OneDrive active users/files"? The closes you can get to real-time data is what Adam mentioned above. Unless all you care about is the sharing scenario - for that you can configure notifications via the BccExternalSharingInvitations parameter, or configure a transport rule that adds additional recipients.