QQ: From a Stream admin perspective what files do I need to migrate from Classic Stream to new Stream? Is it all the content on Stream Classic prior to the switch over? Or are certain files transferred automatically to OneDrive and SharePoint?
Nothing will be automatically migrated. We are doing a massive round of updates to the migration help docs as the tool is moving to public preview so all of you can use it. The updates docs will be posted next week.
But you can read here we call out that you will have to choose what to move.