Hi T,
You may access Teams' notification settings by clicking on the Menu, your profile symbol, or the Settings and more option. You can decide whether to receive notifications about meetings, persons, channels, and general activity. The notification style for Windows or Mac can also be chosen. You can personalize channel notifications by enabling all activity notifications, disabling all notifications, or both.
Reference: https://support.microsoft.com/en-us/office/mana...
If you have something specific about getting notifications about adding something, please do let me know so that I can further help you.
Kind regards,
Jayzar