You can report anonymously through Crimestoppers if you are in the UK, or similar local services, which guarantees your anonymity while passing information to law enforcement. Do not share or download the file. To make sure you get the right help, can you tell me:
Report suspicious activity to the FBI via tips.fbi.gov or by calling 1-800-CALL-FBI (1-800-225-5324). 2061081188-FmRtSusx.mp4 ...
Based on standard protocols for handling prohibited digital content: You can report anonymously through Crimestoppers if you