This solution demonstrates an efficient way to handle file uploads by leveraging a Web Worker.

By offloading the upload process, the main thread remains responsive and avoids performance bottlenecks. Crucially, the system does not store the file's binary data in main memory or variables; it operates directly using a file reference to stream the data to the server.

The demo includes both the upload and download functionality. A sample REST API is provided for the server-side component. To run the demo after publishing, you must configure the site property UploadEndpoint.