@startuml
!pragma teoz true
skinparam backgroundColor white
skinparam shadowing false
skinparam defaultFontName SansSerif
hide footbox
participant "Application" as App
participant "Local results directory" as Local
participant "Stage-out" as Stage
participant "S3 storage" as S3
participant "Caller" as Caller
App -> Local: Write catalog.json, Item JSON and otsu.tif
App --> Stage: CWL Directory
Stage -> Local: Read catalog and referenced assets
Stage -> S3: Upload assets; rewrite asset hrefs
Stage -> S3: Upload Item JSON and root catalog
Stage --> Caller: URI record pointing to S3 catalog.json
@enduml