Media tag editor addon for MiXplorer file manager.
It won't be visible in your launcher. It can be uninstalled from Android or MiXplorer settings.
MiXplorer v6.57.6+ must be installed.

Supported formats: MP3 MP4 MOV 3G2 3GP M4V MKV MKA M4A M4B M4P OGG OPUS FLAC WMV WMA WAV.

The Silver version doesn't need this add-on. You can download it from here:
https://play.google.com/store/apps/details?id=com.mixplorer.silver