Why does my phone not find file when trying to convert MP4 to MP3?

[Android Central Question]

My phone is saying file not found when I try to convert to mp3 from a video and I've never had this problem before

 

[Rukbat]

Whatever app you're using to do the conversion can't find the mp4 file in the video. The app "updated" and the ability was removed? (I call that downdating). There's no mp4 file in the video, the audio is contained in a different type envelope?