This naming convention is common for videos uploaded to platforms like Reddit , Twitter (X) , or Discord , where the original filename is replaced by a unique string during the upload process to prevent naming conflicts.
It is an MP4 file, the standard format for web and mobile video. 0h1mjnm97urooawq449v3_720p.mp4
Because this name is a unique hash or system-generated ID rather than a descriptive title, there is no public "feature" or documentation associated with it. However, here is what the filename tells us: This naming convention is common for videos uploaded