Upload a generic file without server-side processing
multipart/form-data. Requires an authenticated user.
Rate limit: 10 requests per 5 minutes.
["documents", "user-123"] → documents/user-123/<uuid>/<filename>.0.type field is one of: image, video, document, other. It is inferred from the MIME type.
No File — 400 Bad Request
File Too Large — 413