Local Print from UI5 App

Hello!

I've an abap coding in the backend which triggers a local printing dialogue in windows.

When it's triggered within the SAP Gui the dialog appears and you can choose a local printer like PDF.

But when I trigger the same coding from an UI5 app out of the browser, the dialogue does not appear.

If debugged it several times and I can't see any difference.

Can anybody help?

Thx