iCloud incompatibility between various macos and iOS versions has been going on for YEARS. As someone who deals daily with 4-5 different devices, I've long run

iCloud incompatibility between various macos and iOS versions has been going on for YEARS. As someone who deals daily with 4-5 different devices, I've long run into this issue. Random bits of iCloud just refuse to sync between certain versions without any word of warning. Not at all new in Catalina.