With student annotation, the workflow is reversed in relation to how submissions are usually made. The teacher uploads a document and the students highlight, draw and comment on the document using the same tools that the teacher uses in Speedgrader. These annotations are the student's submission and can be graded as usual in Speedgrader. But the submission does not necessarily need to be used as assessment material, it can instead be used for discussions or to actively work with course content.
The submissions can then be used in group discussions or as a way to highlight what is central to the course.
The picture shows an example of when a student can highlight, draw and comment in a document.