Some of my students in my adult ESL class have no access to a computer and must do all their work on phones or tablets in the Student App. They are frustrated at not being able to edit their discussions. They were even more frustrated that I didn't understand that they didn't have that ability. I kept trying to tell them about the 3 little dots in the upper right-hand corner. Finally, one of them took a screenshot, and I asked a question on the Canvas Community. That's when I found the answer: "You are correct in that the functionality you’re looking for isn’t currently available in the Student App." Please work on this.
Added to Theme
Increase parity between mobile and web versions of Canvas Theme Status: Identified