: These numbers allow Meta’s automated systems to track the file's origin for copyright enforcement and advertising analytics.

The string is a standardized filename format generated by Meta's platforms (primarily Facebook and Instagram) when a video is processed for download or storage.

Modern filenames include long, randomized segments to prevent "ID guessing". If filenames were sequential, unauthorized users could find private content by simply changing one digit.

: With billions of uploads daily, using common names like "video.mp4" would lead to endless conflicts. These strings ensure every file has a globally unique name.

How to find the original file number of an uploaded photo? - Facebook

: To protect user privacy, Meta strips the original metadata and filenames (like "vacation_2024.mp4") during upload, replacing them with these system-generated codes.

The middle segment typically refers to the larger container, such as an album ID or a specific 64-bit integer representing a content category.