Canvas Teacher App not working

[weaverj]

I am having trouble with the Canvas Teacher App on the iPad. I use the app and the "To Do" button to grade things by hand (so I can annotate student work with my Apple Pencil). That app is not opening student work this morning, and the few times that it has opened, the feature allowing me to annotate student work is not available. Any thoughts on how to fix this?

Thank you!