: This is a popular mobile app used to create Hollywood-style special effects in short videos. Files exported from this app often use the "amf" prefix.
If you did not initiate this download yourself or do not recognize the source: Download File amf (3).mp4
This will help me give you a much more specific answer. : This is a popular mobile app used
: Look at your browser history or the message where you found the link to see what the original topic was. Download File amf (3).mp4
: Generic filenames are sometimes used to disguise malicious content.
: Use an antivirus program or an online tool like VirusTotal to check the file before playing it.