Your D2L locker: Your D2L profile gives you access to a digital locker for storing your files. Simply upload a file into your locker, then log into D2L and download it at the other end. Easy-peasy, and one of the best ways to move your file around. If you need help, ask your teacher, or the teacher-librarian.
Google Drive: As a CBE student, you automatically have access to a CBE Google account. This account includes email, Google Drive, and other useful apps. Why not consider using Google Drive instead of Microsoft Office products to create your documents? Then they are easily accessible anywhere. You could also use your own Google Account, but your CBE one is super-secure. If you don't know your CBE Google gmail username and password, talk to your teacher, or ask the teacher-librarian.
You don't want glitches interfering with your ability to complete homework or submit assignments on time. D2L and Google are your friends. Get to know them better.