Filmyzilla often rips audio from Netflix screen recordings. The "English" track is usually a low-bitrate 128kbps or even 64kbps audio file. You lose the immersive bass and clarity that the official 5.1 surround sound provides on Netflix.

The specific addition of "English upd" (Update) in the search query is crucial. It indicates users want the most recent version of the English dubbed or subtitled files. Many early leaks on filmyzilla have sync issues—the audio doesn't match the video, or the subtitles are auto-generated garbage.