A filename with this structure—a long string of random alphanumeric characters followed by _source.mp4 —is usually a uploaded to a platform before it is compressed for various resolutions (like 720p or 1080p).
: Ensuring every file has a 100% unique name. 0h6aat2df97i1115ibywr_source.mp4
: Distinguishing the original "source" file from the compressed versions served to mobile users. A filename with this structure—a long string of