When you add QlikView or Qlik Sense objects into the Qlik NPrinting Images node they are exported as they are in the original QlikView document or Qlik Sense app. Slide bars in images are not interactive.
When you drag and drop an image tag in an Excel template it will be added as a tag without previewing the final image dimensions as it happens in Word and PowerPoint templates, but in all cases you can set image dimensions as shoewd in the help page http://help.qlik.com/en-US/nprinting/17.3/Content/ReportsDevelopment/ImageDimensionManagementMicrosoftOfficeReports/Image-Dimension-Management.htm
Qlik NPrinting supports Excel pivot tables and pivot charts. Refer to the help pages Creating pivot table using Excel table columns ‒ Qlik NPrinting and Creating an Excel pivot table report using levels ‒ Qlik NPrinting.
Pivot tables and charts in the final Excel reports are normal Excel pivot tables and charts. They contains the data at the moment of the report creation and they are interactive.