My students will often send me essay files as an attachment to a Canvas message. These are draft essays, not for a grade, but for comments. I don't use the SpeedGrader tool to avoid cluttering the Grading and Assignment pages. I will open the PDF file on my computer and use Acrobat Pro to annotate the essay. If I send the annotated PDF file back to the student using Canvas messaging, the annotations do not appear when the student opens the file. If I send the PDF file via regular email, the annotations are present. It would be nice if Canvas messaging did not block the annotations. Have you any ideas about how to solve this problem?