Students can't see my annotations

Students are using ChromeBooks. I am using Google Classroom for my math students to submit work. The most popular way is for them to complete their work on paper, take a picture on their phone, and submit it via Google Classroom. I am able to open with Kami (after the conversion process) and make corrections and give feedback. Then what? I save by hitting the save file icon. How do I get this back to my student?