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Secure file uploads and CDN delivery for Next.js with presigned tokens and multipart support. \n \n Supports server-side uploads via put() and client-side uploads with presigned tokens via handleUpload() to avoid exposing credentials \n Handles files up to 500MB with automatic multipart upload; client uploads bypass the 4.5MB serverless function limit \n Includes file listing with cursor-based pagination, deletion, and content-type management for proper browser handling \n Prevents 16 documented