Unlike MP4, TS files are saved in "chunks." If a download is interrupted or the file is slightly corrupted, the video can usually still be played up to the point of the error.

If your device (like an iPhone or older Smart TV) won't play it, you can convert it to a standard MP4 without losing quality.

Use FFmpeg or Avidemux to change the container from TS to MP4 without re-encoding, which takes only seconds.