Eight BSD flags are available in APFS to lock files, hide them, and restrict them in other ways. None of them synced correctly in iCloud Drive, and four caused other problems.
flag
macOS has an elaborate set of rules determining which types of xattr are preserve during different types of copying, including syncing to iCloud Drive. Here they are in full detail.
He is often claimed to be the greatest of the American Impressionists, and with several thousand paintings to his name he was certainly among the most prolific.
The Eclectic Light Company 