support.microsoft[.]com/en-au/help/4512628/windows-10-onedrive-video-project-syncing-in-photos
This won't effect most people, but if you work with video in the Photo App, come next year it *might* be a big deal.
If you’re syncing to OneDrive but only working on your video project(s) from a single device, there’s nothing for you to do. All your video metadata is automatically saved locally to your device through the Photos app.But if you’ve been using this feature and working on your projects from more than one device, you’ll need to save the latest versions of your projects to your device (or devices) before the feature goes away to make sure all of your recent changes are saved.