If you want to trace who created or modified resources uploaded in a course, you can check the Course Editor logs. 

1. Go to Courses and select a course from the list. 

From the Cast Editor, click on your desired course card.

2. In the Course Profile, click on the logs icon across the Course Title. 

3. Now, you can view the recent activities done in the Course Editor by a specific user. Displayed on top is the user who made the last edit and the time the edit was made. The App activities below are listed from the most recent.