If the video is on a private site rather than YouTube, you can use your browser's developer tools to find the subtitle source. Press F12 or right-click and select Inspect .
Select TXT (or SRT if you need timing data) as the download format. Download sub Uchannel66 txt
Search for files ending in .vtt or .srt . If the video is on a private site
Sites like NoteLM.ai or Noiz.io allow you to paste the URL and fetch subtitles. Download sub Uchannel66 txt