There may be several reasons why synchronization is unsuccessful:
1. Reason One: Network problems
This situation generally occurs on the handset side, you can in the following 2 network switch to try.
(1) Mobile phone operators network (for example, Unicom, mobile)
(2) WiFi
If you are currently using the mobile phone operator network login, you can switch to try WiFi;
If you are using WiFi you can switch to the hand carrier network/other WiFi network attempt.
2. Reason two: conflict notes
In the Desktop edition, you can see if there are any conflicting notes (such as a picture) in the left panel list of notes (or a "rename + Note name" Note).
If so, check the differences between your conflicting notes and the contents of the original note, copy the differences to the normal notes and delete the conflicting notes.
3. Reason three: note synchronization failed
You can take a look at your notes in the Desktop edition, and there are icons in the list of notes (that is, the middle list) that do not appear with an exclamation point or a blue circle. The following figure
This occurs because your note synchronization failed, and you can do the following:
First, in your notes, create a new sync note. Then copy and paste your failure note into your new note, then delete the failed note, and then sync it.
Note: If you are unable to sync after you delete this note in your desktop version, you can find this failure note in your mobile notes (iphone, Android, ipad) and delete it.