Manuals cannot be duplicated while disconnected from the internet (offline)
When duplicating a Manual, please ensure you are connected to the internet (online) beforehand.
Content that has not been synced to the server will not be reflected in the duplicated Manual
The Manual is duplicated based on the latest data on the server.
If you want the content you are editing in the mobile app to be reflected in the duplicated Manual, please first "Save draft" or "Release" the Manual to Upload the data to the server.
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※The behavior differs in mobile app versions prior to Version 5.3.0
Related: Copy manual (Mobile App)
https://teachme.jp/8/manuals/3204665
What does "unsynced" mean in the mobile app?
https://help.teachme.jp/hc/en-us/articles/12095601263769