M4A files using the AAC (Advanced Audio Coding) codec generally sound better than MP3s when encoded at the same bitrate.

If your device language is set to Thai, the prefix will naturally be "เสียง" (Voice/Sound). How to Manage These Files

The .m4a extension stands for . It was developed by Apple as a successor to the MP3 format, offering several technical advantages:

When you use a voice recording app on an iPhone or Android device, the system automatically assigns a name to your file to ensure you can save it quickly without typing.

"001," "002," and so on, are used to distinguish different takes or separate recording sessions.