Thank you for your response. 

Will this process still work when the data being uploaded is the receipt data, not a bill?

I have had a look at uploading the csv file under import invoices and bills but when it comes to the map your column headings section I don't have the required data to complete this. 

There is also a section at the bottom of the import data page where it says 'need to bring in sales receipts, invoices and expenses?' and there is a link to an external app.

Is an external app the only way to upload expenses?