Sometimes Library items need to be updated and replaced. If you do this directly in the library, it will update this reference across all courses where this library item is being used. Here's how:
Choose Library
Click edit on the file you want to replace.
3. Click replace file.
4. Drag the new file into the box
5. Update (save) your file.
Your new file will now be saved in the library and will also update in your course checksheets. Audio and video files work the same.
6. Repeat the above steps to update your next library item.