If the file won't play, it is likely missing its "header" (the data that tells a player how long the audio is). You can try these methods:
Because these are often "temp" files, they may not play in standard apps like iTunes or Spotify if the recording app crashed before saving the final metadata. Common Sources of "RecordTMP" Files RecordTMP (32) m4a
This can sometimes bypass a corrupted header and pull the actual audio out. If the file won't play, it is likely
Apps like GarageBand or Audacity may create .tmp or RecordTMP files while you are recording to ensure data isn't lost if the program closes unexpectedly. How to Access or Fix the File If the file won't play
Many third-party voice memo or call recording apps use this naming convention for active recordings.