The view of CustomBoard will work with normal widgets from KoolReport Pro like the Select of koolreport/inputs package. The FileUploader of Dashboard Framework will not work inside normal view of CustomBoard. But I think, to complete your requirement, the normal Dashboard will work well. In the dashboard, you will add a fileuploader and a table widget, on file uploaded, you will save file to a place and then update the table, the table datasource will read the file and show data.

If you want to make the wizard, it will be better to use the FlexView, here is the documentation:

https://www.koolreport.com/docs/dashboard/widgets/flexview/

The FlexView support multiple views and you can change between them, you can send the parameters between views as well. It is totally customizable as you need. You can use the FlexView to make wizard or drilldown is also fine.

Let look at our example of FlexView in which we turn FlexView into drilldown, sending parameter level by level.

So in your case, you can make a view 1 with FileUploader, after complete, you change it to second view with result.

Please explore and let me know if you need further instruction.