```mermaid
flowchart TD
    Start([開始]) --> CheckCase{是否選取案件?}
    CheckCase -- 否 --> ShowMsg[提示先選案件] --> End([結束])
    CheckCase -- 是 --> SetMode[設定掃描模式為插入模式 smInsert]
    
    SetMode --> CallScan[呼叫 StatrTwainScan 執行追加掃描]
    CallScan --> Redraw[重新繪製樹狀結構並更新筆數]
    Redraw --> ClearLog[清空該案檢核記錄]
    ClearLog --> AutoFocus[自動選取新文件節點並顯示] --> End
```