Why does the video I inserted into the README.md file of GitHub not display, while it works fine in local markdown editor?

This is the content I have in my markdown file, whose’s file link is :link

<table>
  <tr>
    <td><video width="300" height="200" controls><source src="./Appendix_files/146841430-1-16.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
    <td><video width="300" height="200" controls><source src="./Appendix_files/videoplayback.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
    <td><video width="300" height="200" controls><source src="./Appendix_files/VCG.COM.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
  </tr>
  <tr>
    <td><video width="300" height="200" controls><source src="./result_output/output_video.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
    <td><video width="300" height="200" controls><source src="./result_output/output_video2.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
    <td><video width="300" height="200" controls><source src="./result_output/output_video3.mp4" type="video/mp4">您的浏览器不支持 video 标签。</video></td>
  </tr>
</table>

This is the display effect on my local machine:
The display effect of local editing.

I tried using the absolute path of the video and the online link of the video on GitHub, but the result was the same.

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