How do I reply to a message in the Inbox as an instructor?
Canvas makes it easy to reply to messages from other users in your Inbox.
If your recipient list contains more than 100 users, your message will automatically be sent as individual messages to each user. As the sender, you will also be included in the total recipient count.
If you want to reply to a submission comment, you can reply using submission comments in your Inbox or directly from your assignment or quiz.