Instructors have the ability to copy or move files and web links into another course. You have to be an instructor in both courses in order to copy items back and forth.
1) Navigate to the content you want to copy/move
2) Click on the drop down arrow next to the desired item
3) Click on Copy or Move
4) Click on the drop down arrow next to Destination Course and select the course into which you want to copy/move the item
5) Click Browse for Destination Folder and select the folder into which you want to copy/move the item