Hi ppotenza!
ScreenShot evidence? Never had the case.
You probably already know that OneStream provides (for free) on the marketplace some an audit report for security "called "Security Audit Reports". You will also find the Application reports RPTA with many audit reports like Metadata Change, Conf Rules change, Dashboard Maintenance change...
I would like to add to that there there is also a solution called Application Control Manager that might be usefull for you. And it is free. Again 😀
Have a good day,
Nic