Hello @ostranderi ...
The SpeedGrader in your Canvas course does not have a button called "Annotations", but it does have an annotations toolbar. This is briefly discussed just before half-way through this short video tutorial: . You can use the annotation tools to annotate over a student submission in the SpeedGrader. This written Guide will also be of help to you: How do I add annotated comments in student submissions using DocViewer in SpeedGrader?.
I hope this helps, Isabel. Please let Community members know if you have any other questions about this....thanks! Take care, stay safe, and be well.
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