How do I know if I have checked all the files in the Dropbox?
The dropbox summary will tell you how many total files are available and how many files are unchecked.
How do I know who has not submitted an assignment to the Dropbox?
When you click on the dropbox folder for a particular assignment, it will display a list of users who have not submitted an assignment yet. It will also show you the users who have uploaded an assignment and a link the the assignment.
How do I download a file and mark it as downloaded by instructor?
Check mark all the assignments you wish to download, then select the download link at the bottom of the page. D2L will zip all the files and make this file available for you to download. Save this file to your computer.. Extract the contents of the zip file into a folder to view the contents.