Can I see when someone uploads files through my links?
Yes. This option is available when sharing a link via the Koofr web app. When you click Share next to a folder in the Koofr web app and select Receive files you can tick the Email notification checkbox in the bottom and the system will notify you over email when files are uploaded over your upload - Receive files links.
Note: This option is only available for users with paid Koofr account.