A "Manual Management" section has been added to "Skills" in the administration settings. You can view a list of manuals used in skills and re-import manuals that have new versions published in Teachme Biz one by one, or all at once using "Update All".
As a result of this change, "Sync manual information" in the skill editing screen has been removed.
Related online manual
https://teachme.jp/8/manuals/50594503