It would seem that there's a new page added detailing FileProvider macOS Support - https://developer.apple.com/documentation/fileprovider/macos_support If you compare the main FileProvider documentation page - https://developer.apple.com/documentation/fileprovider to a Waybackmachine page back in June, you'll see that the link to "macOS Support" did not exist before and was recently added. If you click into a protocol - https://developer.apple.com/documentation/fileprovider/nsfileproviderreplicatedextension there, you'll see that availability is set for 11.0+ Perhaps this means that the API will be available for use on Big Sur? Perhaps someone can try out beta 3 and see? Perhaps someone from Apple can give us an indication on whether it'll be removed again before GM like last time?