Hi Cadet, Sherene, welcome to forum. It is a pleasure to be able to help you : )
Per our research, currently Stream (Classic) will retire soon. Therefore, Stream (Classic) does not support uploading videos.
So I would recommend migrating files to Stream (on SharePoint) and using Stream (on SharePoint) as the primary way to manage video in the future.
You can refer to the documentation: Stream (on SharePoint), the new version of Microsoft Stream
And the "Stream" web part only works for Stream (Classic) content at present, it doesn't work with videos from OneDrive or SharePoint.
Since Stream (Classic) is using video files stored on the retiring microsoftstream.com service and Stream (on SharePoint) is uploading and using video files directly stored in SharePoint, Teams, and OneDrive.
I recommend uploading videos to Stream (on SharePoint) and using following web parts that support adding videos from OneDrive to SharePoint pages.
- File and Media web part
- Highlighted content web part
- Hero web part
- Quick Links web part
You can refer the documentation:
How to feature videos in Microsoft 365 with pages, sites, & portals
Using videos on SharePoint pages
Hope this helps.
Best Regards
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