@Oblivius welcome to the forum.

Notebook sharing is a feature of the Joplin Server / Joplin Cloud software. Notebook sharing can only be enabled using a server running the Joplin server software. It cannot be added for those using third-party could storage services as the sharing takes place server to client not client to client. It's the Joplin server software that does all the work in setting up and authorising the sharing.

So someone who has a "Pro" account on Joplin Cloud can share a notebook with another user on Joplin Cloud by authorising that other user to access the notebook. The server software then makes that notebook available to the other user and both users now have access and can collaborate.

As mentioned above, notebook sharing is a "Pro" account feature. This means that the user doing the sharing requires a "Pro" account (See 1 in the image below).

The person they are sharing with can be a "Basic" account user and they can collaborate with a "Pro" user on a "Pro" user's shared notebook (see 2 in the image below). So the "Basic" account user can accept the share from a "Pro" user but cannot create one themselves (see 3 in the image below).

Note publishing is different (see 4 in the image below). This basically makes a static webpage from a note that is available over the Internet on the Joplin Cloud server. There is no online editing. This therefore requires no Joplin Cloud account for anyone else to access that published note. They do not even need Joplin installed as it's just a webpage.

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