You may have issues with the link if you did it this way: Add Materials > Add File/Link/External Tool.
You will need to do the following:
- go to your list of materials and click the Gear to the right of the Evaluation Link.
- click edit
-
click on the ABC icon so is says "Display in new window.
- Click save changes.
Since this is anonymous, there is no way to tell if a student submitted or not.