UiApp has been deprecated. Please use HtmlService instead

Starting point:

function openDialog() {
  var html = HtmlService.createHtmlOutputFromFile('export');
  SpreadsheetApp.getUi()
      .setWidth(640)
      .setHeight(400)
      .showModalDialog(html, 'Export');
}

Docs: https://developers.google.com/apps-script/guides/html/

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