Aff1a7a9f3fd4d48fecaf5b4375486e6.mp4 [720p]

This string appears to be a or a unique identifier used by various online platforms (like messaging apps or content delivery networks) to store and name video files. Because this is a generated ID rather than a descriptive title, I cannot tell you exactly what is inside the video without more context. What this usually is:

Sometimes people share these hashes as "codes" to find specific content on file-sharing sites. How to use or identify it: aff1a7a9f3fd4d48fecaf5b4375486e6.mp4

Platforms like Discord often rename uploaded files to strings like this to ensure every file has a unique name in their database. This string appears to be a or a