The filename appears to be a system-generated or timestamped media file. Based on the components of the name:
: These frequently use a combination of a camera ID and a precise Unix timestamp for each recorded clip. 73755-_1678837156.mp4
: Platforms that store user-uploaded videos may append a timestamp to the original file ID to prevent overwriting files with the same name. The filename appears to be a system-generated or
: Apps like Telegram or WhatsApp sometimes rename saved media using internal database IDs and timestamps. 73755-_1678837156.mp4