Can I see when someone uploads files through my links?

Yes, this option is available in the Koofr web app and mobile app for Android.

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 an email when files are uploaded over your upload - Receive files link.

Koofr mobile app for Android

Open the link editing window and tap the toggle icon next to Email notifications . The system will notify you over an email when files are uploaded over your upload - Receive files links.

This option is available for users with Koofr accounts with subscriptions.