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Here are some tutorials for how you might share files (and folders) in your courses. But before choosing any one of these, consult your course syllabus or other assignment instructions. Has your professor approved, or directed that you use Google Drive to share files? Also, see if your professor has chosen one of these as the course standard.
Simple sharing: upload and share a video or audio file with your professor.
Using Google Drive to Share Videos in D2L Discussions
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