Just a note here that Prototype is technically part of the Sync now with this release. That's why you wont' see the icon in Craft manager with this release explicitly. If you were in the beta instance prior, make sure to update to the full production release. :)
Make sure you check within Sketch, too. My version of Craft doesn't show Prototype as an option, but it still appears in Sketch if you're running v1.0.31.