Major High Sierra - iOS-14 sync issues

Everything went well when I upgraded from iOS 12 to iOS 13, except that some iOS-macOS **High Sierra** synchronizations stopped working, or stopped working in full capacity. Before upgrading to **iOS 14**, I'd like to know. What apps will stop working (as) well between iOS and a macOS MacBook that cannot be upgraded beyond High Sierra. Is the list announced by Apple? Have you seen a list compiled by reporters? **Update** As much as I'd love to see examples of good dual-OS apps written by independent developers making it possible to do a bit on macOS, continue from iOS (under the same appleID), then return to macOS, etc, the only good ones I've seen and use are the ones written by Apple. So to make the question specific. Does upgrading to iOS 14 break any of the following? 1. Notes, e.g.: - Add a shopping list on macOS. See it on iOS when you're shopping - Take a photo on iOS. Add the photo to a note. Pick up the picture on macOS. 2. Photos, e.g.: - Add photos to your list of favorites on macOS. See them on iOS. 3. FaceTime, e.g.: - Receive a phone call on iOS. Answer with headphones on macOS. **Related:** - [Does iOS 14 sync with iTunes 12.8.2.3?](https://www.reddit.com/r/iOSBeta/comments/itg9fa/does_ios_14_sync_with_itunes_12823/) - [Manual Photo-Sync from Mac to IOS 14 still broken](https://www.reddit.com/r/ios14/comments/iyc18t/manual_photosync_from_mac_to_ios_14_still_broken/) - [iOS 14 devices with macOS High Sierra 13.6?](https://forums.macrumors.com/threads/ios-14-devices-with-macos-high-sierra-13-6.2254587/) - [Syncing iPhone (iOS 14) with High Sierra using iTunes](https://discussions.apple.com/thread/251814814)