If another user cannot see a notebook, this is usually due to missing project permissions.
Notebooks are always associated with a specific project, and only users who have access to that project can view its notebooks.

What to check:

• Confirm that the user has been granted access to the project.
• The project name is shown in the notebook header and can be used to verify the correct project.
• If necessary, update the user’s project permissions and ask them to reload the notebook.