I've been doing some playing around this morning. This appears to be a one-way issue. Files from iOS sync perfectly and appear on my Mac within seconds. However, files from my Mac don't sync at all. Not slow or occasional, simply not at all. But there are exceptions...
- If I create a new note on macOS, it appears on iOS instantly. If I delete that note on iOS, it stays on macOS for up to 5 minutes. If I create a new note on iOS, however, it doesn't appear on macOS at all. This applies to edits as well.
The problem is, I've done all of the stuff that would usually fix it. I've done a clean install and I've disabled iCloud several times. Nothing changes. Now I'm worried about taking iCloud offline again and losing any local changes I may have forgotten to backup.
This is such a mess.
Contacting Apple Support is even more hopeless than it used to be. I tried the email support option on their support page. It lets you fill our your name, email and Apple ID. Then it submits the form, but there is no field to mention anything about your issue. WTF?