[LivresInOz]

UPDATE: SOLVED!
It turns out it was just an odd choice of 'default settings': you have to 'import embedded data' to actually see your notes!

The reason that the note I had just exported as a PDF did not actually show the scribbles I had just done, is that by default, NeoReader was set up not to show such inking.

You have to select "import embedded data".

Perhaps better, go to settings and select "Automatically import embedded data" so it does it for all future PDFs.

If someone has this problem in the future:
1. Tap the middle of the pdf
2. Go to the menu top right (with the three lines)
3. Select one of those two options

Perhaps one reason they did this, is suggested by the warning dialogue box that comes up when you DO choose to import the 'embedded data', saying that it could take a long time.

So maybe doing it automatically slows down opening (though surely not by much?)

This choice by Onyx certainly creates some confusion at first: I'm a reasonably experienced user and I wouldn't immediately consider the need to 'import' the data of a note I just created.

Onyx, this can easily be fixed!
When you export a note to a PDF, a dialogue box comes up anyway.
(The first time it does) Boox could simply add "To see your notes, be sure to 'import embedded data' via the menu at top-right" or something.

On a positive note, I do like the fact that they have incorporated the ability to jump to the new note with just a tap.

(PS Don't get me wrong - there are alot of brilliant things about Boox. I remain a fan (potential privacy concerns aside!). But there are some things that are crazy-making too! Now that I know the fix though, this is not one of them)