Question: Can you recommend a service that offers customizable file uploading, processing, and delivery for my web application?

If you need a service that lets you customize file uploads, processing and delivery, Transloadit is a good choice. It's a full-service product for receiving user uploads, delivering them through a Smart CDN and transforming them in many ways, including video encoding, image processing and document processing. It supports several programming languages and has SDKs for several platforms, so it's good for developers and businesses.

Another contender is Uploadcare, a full-featured file management service with tools for uploading, processing and delivering files. It includes features like real-time image transformations, AI-powered image operations and automated document conversion. Uploadcare is designed to be flexible and scalable, with secure delivery options and customizable integration tools, so it's good for a broad range of use cases.

If you're more focused on image and video handling, Cloudinary is a strong service for developers and businesses that need to handle media and deliver optimized images and videos. It offers AI-powered transformations, media management and image/video optimization, which is why it's popular with e-commerce and content creation sites. The service can be customized, and there's a free plan, so it's good for a range of business needs.