How do I choose an assignment group in a module in the Canvas Student app on my Android device?
If your Modules page asks you to choose an assignment group, you need to choose which assignment(s) you want to select before you can progress to the next assignment.
In the Dashboard, tap the name of the course you'd like to view.
Open Course Navigation
Tap the Course Navigation menu.
In Course Navigation, click the Modules link.
Choose Assignment Group
Locate the current module and click the Choose Assignment Group link.
View the assignment options by tapping the tabs . Locate the assignment you want to select and tap the Select button. 
Note: Once you select an assignment, you cannot select a different assignment.
View Selected Assignment
View your selected assignment.
Note: If the link generates an error message, you can access the assignment by returning to the Modules link in Course Navigation.