kekingcn/kkFileView ? reverse-engineered prompt

Build me a web app that lets people upload a file and preview it in the browser without downloading it first.

I want it to handle the common office files like Word, Excel, PowerPoint, PDF, text, images, zipped files, and a few other formats when possible. The main screen should make it easy to pick a file, view it cleanly, and switch between pages or items inside an archive. For images, basic zoom and rotate would be great. For documents, show a readable preview with sensible page navigation. Also include a simple REST API so other apps can send a file and get a preview link back.

Make it feel like a practical self hosted tool, with a clean homepage, clear upload flow, and simple setup instructions. If you need to look up current docs or best practices for any library, go ahead.