Are you trying to or determine how it got onto your device ?
: This specific file name often pops up in folders for CapCut templates or "velocity" edits where a specific audio cue (the "mmm" sound) is synced to a visual transition. mmm (143).mp4
While "mmm (143).mp4" isn't a single universal "feature," here is the context typically surrounding files with this specific naming style: Are you trying to or determine how it got onto your device