If the MP4 file already has subtitles, but they are not playing, you may need to extract them to a separate file for editing or to use in a different player.
Looking for an interesting guide on how to make your file (or similar work) stand out? While "sone061mp4" often refers to specific media files, creating a compelling "work" or "how-to" guide around any topic follows a few key principles for success. Core Elements of an Interesting Guide