When you are ready to share content, in the global navigation, click the Courses link, then click the name of the course you want to share the file from. Open the Files link. To share a document, image, video, or audio file, next to the file, click the Settings icon then click the Share to Commons link. You will need to select a sharing option, select the content license, and add metadata.
Please ensure you remove any personal or sensitive data before sharing.