The blog post provides a comprehensive guide to building an advanced file picker using React, complete with drag-and-drop functionality, file selection, and upload progress tracking. The project is scaffolded using create-react-app, and additional libraries such as axios, nanoid, and classNames are installed to handle HTTP requests, unique ID generation, and CSS class management. The file picker consists of a Dropzone component for file selection through clicks or drag-and-drop, a FilesList component for displaying and managing selected files, and a progress bar to indicate upload status. The upload process is managed using axios, which provides real-time progress updates, while the file picker component handles file selection, upload initiation, and file removal. The tutorial includes detailed implementation steps, including the creation of necessary components, styling using CSS modules, and handling file uploads to a specified server URL. Additionally, the post highlights the importance of managing cross-origin requests during development and offers a sandbox link for exploring the finished code.