The Canvas Teacher app is designed for instructors to navigate Canvas on mobile device. Instructors can perform simple edits and grade assignments on the app. Review the guides available at the link below.
Some options may be limited in the Canvas Student app and you may need to login to the mobile web browser. See the following guide to see what mobile web browsers are supported.
The Student app does support students submitting assignments in the app; however, please note for student submission process will be different when compared to submitting assignments in a desktop web browser. On mobile devices assignments files will need to be saved in a third party application (Google Drive, OneDrive, Dropbox etc.). Then in the submission process students will need to choose the third party application where the file exists when submitting the assignment.
iOS and Images
By default images created with your device's camera will be saved in the HEIC format which is not viewable on Windows computers. See Web Browser Troubleshooting Tips for more details.