We recommend that whenever you add new files or set up a task for students, you add a notice to the News forum on the course. This way, students will be notified of the change.
There is also another option in which the teacher of a course in the new Online Classroom can set a rule in their courses that the system sends a notification when you update the contents of a folder. Keep in mind that:
This rule sends a notice when the teacher adds or deletes files inside a folder in the Moodle course. For students to receive notification, you must activate the rule.