When you release or update a manual using the Web Browser, you can choose to notify specified users/teams of manual release or update.
▼Notify users about manual release or update (Web Browser)
https://teachme.jp/8/manuals/14651979/
If you release or update a manual using the mobile app (iOS/Android),
all the users who can view the manual will be notified automatically.
*Please note that notification recipients cannot choose whether to receive this notification.
Related:
Can I turn off notifications from Teachme Biz?
https://help.teachme.jp/hc/en-us/articles/900005510026