You cannot duplicate manuals when disconnected from the internet (offline)
When duplicating a manual, please ensure you are connected to the internet (online) in advance.
Content that is not synchronized with 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 to reflect content being edited in the mobile app in the duplicated manual, first "Save as Draft" or "Publish" the manual to upload the data to the server.
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*Behavior differs in mobile app versions prior to 5.3.0
Related: Copy manual (Mobile App)
https://teachme.jp/8/manuals/3204665
Please tell me about "Not Downloaded" in the Mobile App Bookmark
https://help.teachme.jp/hc/en-us/articles/44177454613273