Firebase provides secure file uploads and downloads for the Firebase application. This article explains how to build an Android application with the ability to select the pdf from the mobile phone and upload that pdf to the Firebase Storage.
Read moreIs Firebase safe to store data?
As a default Firebase database has no security , it’s the development team’s responsibility to correctly secure the database prior to it storing real data. In Google Firebase, this is done by requiring authentication and implementing rule-based authorization for each database table.
Read more