Cannot play HLS(m3u8) video

[BraveSail]

Technical Details
Nextcloud Version: 20.0.2
Browser: Microsoft Edge(Chromium) 86.0.622.69

Expected behaviour

the video player should play HLS video normally(videojs's feature)

Actual behaviour

the m3u8 file just download by click.

Steps to reproduce

1.disable viewer app.
2.use ffmpeg to segment mp4 then get .m3u8 and .ts files.
2.click the m3u8 track file.
3.the m3u8 track file just download.

I used hls not mp4 because when play huge(4GB+) videos the browser sometimes freezed by buffering too much data, or still buffering data after close that video. This waste too much bandwith. But videojs can solve this by using hls. I know files_videoplayer is using videojs so it can play hls video right?