craft cms
Craft 6 rebuilt asset uploads from scratch: tus, direct-to-S3 multipart, and uploads your PHP never touches
Alpha.19 replaces Craft's upload stack with Uppy, shared upload sessions, and tus/S3 multipart transports — uploads that can bypass the PHP process entirely and survive you navigating away mid-upload. It's also a real breaking change for anyone hooking the old multipart endpoints.