For Windows users, you can copy the video, open File Explorer> OneDrive – Personal folder, and paste the video here. For Mac users, you can download and install the OneDrive app for Mac first, and create an account to log in. Then copy the video and paste it to the OneDrive - YourTenantName folder in Finder. For iOS/Android users, you should open the OneDrive app on your phone, hit the plus button, and choose the Upload option to put a video on OneDrive.