We are currently rolling out the ability to have threaded comments on audio and video files in M365 (SharePoint, OneDrive, Teams, and Yammer). This allows you to have conversations and collaboration around video and audio files in M365. This is just one more piece starting to be put in place to rebuild Stream (classic) capabilities natively into M365 with Stream (built on SharePoint).
Currently as of May 24, 2022 this feature is enabled to 50% of worldwide users. (GCC will be after we hit 100% of GA). We hope to move this to 100% of world wide in the coming several weeks.
To access comments, just open a video or audio file in the SharePoint and OneDrive web video player and click the comment icon on the right toolbar. Anyone who has view access to the audio or video file will be able to add a comment.