file-uploads

To handle large file uploads without blocking, use multipart uploads and streaming to transfer chunks directly to S3 or Cloudflare R2. This prevents server blocking and ensures scalable cloud storage management for large payloads.

A presigned URL is a secure, time-limited link allowing clients to upload files directly to S3 or Cloudflare R2. Use presigned URLs to offload upload traffic from your server and securely manage file transfers.

To validate file types and sanitize filenames during secure uploads, check metadata and content-safety before transferring. Sanitizing filenames and validating sizes minimizes risk before storing files in cloud storage.

Yes, this file upload approach works with both S3 and Cloudflare R2. It supports generating presigned URLs and multipart workflows for either platform, allowing flexible and scalable cloud storage management.

The best way to securely receive user files in a web app is to validate file types and sizes, sanitize filenames, and use presigned URLs or streaming for cloud storage. This abstracts complexities while ensuring safe file handling.