A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hello Ka Ki,
Thank you for posting back and sharing with me the detailed information.
Per my experience, I'd like to share following information:
- The "Open in App" option will appear when a Microsoft 365 work/school user shares a file with a Microsoft 365 work/school user with Edit permission. And Do Not use the permission "Anyone with the link can edit".
- The "Open in App" option won't appear when a personal user shares a file with a Microsoft 365 work/school user nor when a Microsoft 365 work/school user shares a file with a personal user.
If it's possible and convenient, you may try to use your school account and share your notebook with other person's work/school account. Then the "Open in App" option will appear when they open the shared notebook.
Let me know if you have any concerns. I'll be glad to help you.
Thanks for your time and cooperation! Have a nice day!
Best regards,
Tina