Problems with third party syncing

Hi,

I am using Boox NoteAir3C. I have setup Dropbox as third party cloud storage.

Syncing worked fine for a couple of months. Now I noticed that the last 5 months were actually not syncing with Dropbox.
I unbind and rebind the account. This worked for new notes.

The problem is following:

I cannot sync all the existing notes and the folders with Dropbox. IMO this should happen if someone clicks on the "sync-button" on the top right of notes. Unfortunatelly this doesn't work.
In order to get the notes synced with Dropbox I need now to open manually each existing note and save it. For a large number of notes this is more than painful.
Moreover if notes are moved within folders, those changes are not applying to the dropbox folder/files structure.

My suggestion is to have the top right "sync-button" syncing the third party files and folders as well. Even better to have the option to enable auto-sync files/folders on schedule or on on note exiting(saving).