participant Client 1
participant Client 2
participant Controller
participant Backend
Client 1-> Controller: POST Data
activate Client 1
activate Controller
Controller -> Backend: Save Data
activate Backend
note left of Controller #yellow: Controller blocked\nuntil result received
Backend --> Controller: Result
deactivate Backend
Controller --> Client 1: Result
deactivate Client 1
deactivate Controller
// 2nd Upload
Client 2-> Controller: POST Data
activate Client 2
activate Controller
Controller -> Backend: Save Data
activate Backend
note left of Controller #yellow: Controller blocket\nuntil result received
Backend --> Controller: Result
deactivate Backend
Controller --> Client 2: Result
deactivate Controller
deactivate Client 2