Hello @MarcellaHerrera
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with viewing comments on the app. We may need more information to better assist, but presuming you are trying to view comments from your teacher on the mobile app Here is the Canvas guide:
https://community.canvaslms.com/t5/Canvas-Student-iOS-Guide/How-do-I-view-assignment-comments-from-m...
