Android File Manager App Development

I need a straightforward Android utility that lets users browse, organize, and share files stored on their device. The core requirement is reliable file management paired with an intuitive “share” flow—users should be able to select one or multiple files and quickly send them via the built-in Android share sheet.

Scope of work
• Build a clean, modern UI that follows current Material guidelines.
• Implement folder navigation, basic search, and multi-select actions (copy, move, delete, rename).
• Add a “Share” action that hands files off to any compatible target on the device (e-mail, messaging apps, cloud drives, etc.).
• Ensure smooth performance on Android 8.0 (API 26) and up.
• Deliver production-ready APK plus full source code in Android Studio (Kotlin preferred, Java acceptable).

Nice-to-have (not mandatory): hooks for future cloud storage integration or on-device encryption. If you can architect the code with extensibility in mind, note that in your proposal.

I will provide a simple wireframe and app icon. I’m looking for clean code, concise comments, and a short walkthrough of how to add future features. Estimate the timeline in your bid and share one similar utility app you’ve developed.