The manual URL is changed in the following cases:
- If manual was copied (Copy of the manual will have a different link, while original manual link is not changed.)
- If manual was restored from backup
Note that even if you change the folder or subfolder of the manual, the manual URL will not be changed.
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Related: Copy manual (Web Browser)
https://teachme.jp/8/manuals/4929576/
Related: Restore manual from backup (Web Browser)
https://teachme.jp/8/manuals/9917832/
Related: Change manual folder (Web Browser)
https://teachme.jp/8/manuals/4929397/