IE 11 Not work on builded React code

Hello Support!

Just only can show the version details as google chrome console log, the IE 11 not found

Google Chrome PDF Express version details as below (Run on “npm run build”)

UI version : 6.3.3
Core version : 6.3.4
Build : Ni8yOS8yMDIwfDZhZDkzMGE=
WebViewer Server : false
Full API : false


IE 11 PDF Express version details as below (Run on “npm start”)

[WebViewer] UI version: 6.3.3, Core version: 6.3.4, Build: Ni8yOS8yMDIwfDZhZDkzMGE=, WebViewer Server: false, Full API: false


@pdftron/pdfjs-express”: “^6.2.1”,

"axios": "^0.19.2",

"debug": "^4.1.1",

"react": "^16.6.0",

"react-app-polyfill": "^1.0.6",

"react-dom": "^16.6.0",

"react-router-dom": "^5.2.0",

"react-scripts": "2.1.1"

-- react-scripts@2.1.1 – webpack@4.19.1