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