If you have videos stored in Stream Classic, you need to move any videos you want to keep before August 29 to make sure you have uninterrupted access to your videos.
When it comes to moving your videos, you have two options: download your videos manually or requesting a video migration. The option you choose will be determined by factors such as the number of videos you have and the number of videos you want to keep. For an overview of your options, see Decide where your Stream Classic videos will go.
Stream Classic is a standalone app that is not connected with the Microsoft 365 experience. Stream (on SharePoint) seamlessly integrates with apps across Microsoft 365, so you get the same experience no matter where you add or engage with video content.
For an overview of how Stream Classic and Stream (on SharePoint) differ, please review this article from Microsoft: https://learn.microsoft.com/en-us/stream/streamnew/new-stream/.
Stream Classic is the legacy version of Microsoft Stream. It is being retired to make way for Stream (on SharePoint), which offers enhanced features and better integration within the Microsoft 365 ecosystem. The retirement allows for a more unified and seamless video management solution.