How to get onenote notes from dropbox and one pc to onedrive to another pc

SOLUTION FOUND :grinning:

Dear Jay, thanks for your answer. I know that Dropbox is not designed to implement Microsoft OneNote and yet the combination of both worked for me for years (on MS PC, Mobile Android App OneNote did not work) and it would be great if it were supported.

I do LOVE Dropbox AND OneNote and use both all the time!!! Since there is no support between the two so far I had to change my OneNote Notebooks from Dropbox to OneDrive to get them to my new PC - which was a big challenge.

With the new lap laptop it was not only opening the files in the App OneNote for Win10 on the new PC
(please forgive me, if I remember your answer incorrectly, I can't look at it writing my message).

After some hours and a lot of research and trial+error I found a 
SOLUTION for transferring MS OneNote Notebooks from old Windows PC (storage location Dropbox)
to new Windows PC with the change of storage location to OneDrive:

(NB = MS OneDrive Notebook)

• On the old PC create a new NB (with a similiar name as the old one, like "xxx OneDrive" - you can change it later)
  IMPORTANT: as storage location select OneDrive.
• Open the old NB and copy the paragraph (if more paragraphs repeat this and the next step for every paragraph)
• Sycn OneDrive and check the new NB
  (* Webversion   * App Onenote Win10 on the laptop   * App OneNote App on my Android mobile)
• When OK close the old NBs on old PC
• On Webversion Onedrive/Documents delete old NBs.

I hope this solution helps other users with the same problem. I am currently in the process of doing the above with all my NBs and I hope I got it right.

Additonal information:

• NBs are not stored as "normal files" in "normal folders" but only as links to OneDrive, this makes things so difficult. The factor that closing NBs does not mean deleting NBs makes it even more complex and error-prone. Synchronisation between OneNoteWeb, OneNoteApp (PC+Mobile) is very slow sometimes which makes it seem something hasn't worked but in reality you have to wait (and/or sync manually).
• In the past you could export a Notebook into onepkg-format, this "file" you could copy/paste to another location. But there was a change with Microsoft and now this does not work anymore.