macOS Catalina arrived yesterday, but the expected iCloud Drive folder sharing feature didn’t.
iCloud Drive photo sharing would all users to share folders with a private link. Anyone who has access would be able to see the folder in iCloud Drive, add new files, and get the latest versions of files.
However, on its web page listing macOS Catalina features, Apple notes that this feature is coming in spring.
Right now you can share an individual document that you have stored in iCloud Drive; however, an entire folder can’t be shared.