1. Click on the green Add button.
2. Select a post or activity. (If activity, create a new activity and then add a template or instructions. Both a new post or the attachments in an activity will send you to the create new content window.) Once here, click "Upload" to get files from either your computer or Google Drive.
3. Select from Computer (1) allows you to browse for a file on your computer. Select from Google Drive (2) allows you to browse your Drive. You can also just drop local files into the Drop File (3) area. Once you have selected your content, you can select students and folders for the post next or when assigning an activity.