Can I skip sheet selection if there is only one sheet in the file in Portal 2.0?

Unfortunately there is no way right now to skip sheet selection if your .xlsx file only contains one sheet in Portal 2.0. 

Our newer Portal product, Portal 3.0, does skip sheet selection if there is only one sheet in the file. For more information about the differences between Portal 2.0 and Portal 3.0, click here.