Thanks for your suggestion! I thought about that myself, but somehow I prefer using the task module for single tasks.
I, however, think I've found a solution. Inside the task activity, you can remove the permission "Use uploading in file picker" (repository/upload:view) for students (or authenticated users). And that actually prevents the students from uploading any new files.
I, however, think I've found a solution. Inside the task activity, you can remove the permission "Use uploading in file picker" (repository/upload:view) for students (or authenticated users). And that actually prevents the students from uploading any new files.