How To Send Notifications To Multiple Users After An Event Happened?

Hey I'm new to android and i made an application that enable the user to upload a file (Professor) so that Students can download it for educational purposes. I came to point that

Solution 1:

If you're using Firebase Database along with FCM, you could make use of Cloud Functions for Firebase. Specifically, the Database Triggers.

Say, the professor uploads a file (maybe using Firebase Storage) you could have a trigger set to a node (e.g. uploaded_files) that will send push notifications to those specific users -- where I think making use of Topics sounds good here (students could star a Prof to subscribe for updates).

Simple and direct to the point.