A knowledge base article about Adding subtitles & closed-captions to videos in YouTube provided by the UC Berkeley IT Service Hub - Knowledge Portal
If you create content in YouTube, you must make your content accessible to
people with disabilities, including those who use assistive technologies.
Google has published instructions for adding subtitles and closed-captions
to videos on their support page, Add subtitles & closed captions
<https://support.google.com/youtube/answer/2734796>.
Read more about how to make your videos accessible
<https://dap.berkeley.edu/learn/how-do-i-make-videos-accessible> and how to
edit captions on YouTube
<https://dap.berkeley.edu/learn/techniques/how-do-i-edit-captions-youtube> on
the Digital Accessibility Program website.