You need to extract the embedded subtitles to make .SRT file that you open in the Subtitles panel. Open or select the video file, use Properties > menu > Extract Subtitles…
Docs at Subtitles Panel
You need to extract the embedded subtitles to make .SRT file that you open in the Subtitles panel. Open or select the video file, use Properties > menu > Extract Subtitles…
Docs at Subtitles Panel