TikTok did not have a feature that notified users when someone shared their video. TikTok's notification system primarily focused on interactions such as likes, comments, and follows. If someone shared your video, you wouldn't receive a direct notification informing you about it.
However, please keep in mind that social media platforms frequently update their features and functionalities. It's possible that TikTok may have introduced new features related to video sharing notifications . To get the most accurate and up-to-date information, I recommend checking TikTok's official support documentation or the app's settings for any recent changes.