my iPhone can not upload the contents in iCloud account notes to iCloud, which means my Mac and iPad can not sync it. But the iPhone can sync the contents edited on my Mac and iPad. So that I can edit the notes on Mac and check it on iPhone but can not edit the contents on iPhone and check it on my Mac. Google a lot but no answer. Tried log out apple ID and log in again already but it did not work. My iOS system is 10.2 the updated one. Any one can help me? Thank you very much
I bought iPhone 7 a few days and got exactly the same problem. My old iPhone 5S still syncs perfectly but new one doesn't.
Have done everything: logged out Apple ID and in again, turned off iCloud Notes syncing and then on again, still nothing. Even set my new phone up as a new iPhone but the Notes app is still not syncing with other devices where it works perfectly. I can see notes made on other devices but edits made on iPhone 7 are not showing up on my old iPhone, iPad and Macbook Pro.
I tried all these things here but mine isn't still working - maybe it works for you: http://www.idownloadblog.com/2016/12/19/icloud-notes-not-syncing-fix/
I had the same problem a while back, updating my mac and my iPad to the most recent version fixed it.