Package com.iizix.prop.upload

The file upload channel of one client session: the container under $env that carries the upload calls between the client's FileUploader and the server's upload service (FILE-UPLOAD-DESIGN.md section 1.2, amended 2026-09-25: ruling row 10 of 2026-09-24 moved the JS sender from the component to the client session; built by CC-UPLOAD-A step A1).

One request of a client to upload files: what the client declared - the files with their names, types and sizes, its sequence number, the automatic failure notice switch and the types the requester accepts - and where it came from (design UPLOAD-UI-DESIGN.md edition 2, section 2.2; built by CC-UPLOAD-U1).