How to make annotations efficiently on students' written work on Canvas?

I grade numerous assignments in Canvas that I must also grade by hand. I have developed a rather time-consuming method of giving students feedback -- namely, annotating the copy in Speed Grader, offering overall comments in the comments section, then downloading the student's work with an appropriate file nomenclature, and reuploading it to the comment before submitting. This course is intensive in translation and writing, so am interested in any more efficient way students can get their feedback with fewer steps.