I need a full-featured cloud-storage application built exclusively for Android. Every user should start with a free quota and have the option to unlock additional space through a paid monthly or yearly subscription handled by Google Play Billing. Smooth upload/download, folder management, offline access and a polished Material-design interface are essential. Authentication requirements • Email and password • Social media login • Two-factor authentication Beyond the Android client, I’ll rely on you to set up a secure, scalable backend so I can manage storage tiers, user analytics and subscription status from a simple web dashboard. Encryption at rest and in transit should be standard, and the architecture must be ready to scale as the user base grows. Deliverables • Production-ready Android source code and signed APK • Complete backend code / configurations • Deployment and hand-over documentation When you respond, please focus on your direct experience with similar Android or cloud-driven apps and the cloud platforms you prefer to use. I’m ready to set milestones and move quickly once we agree on the technical approach.