I've successfully amended my Magento 2 PDF invoices, changing the styling, adding a footer etc. I've managed to move the 'Qty' so that it's first in the item list, as below:
However, I can't seem to find out how to amend the items if a bundle product is added:
I would like to move the 'Qty' first, and add the individual bundled items SKUs (in the correct place - the example above's SKU (QUARTERLY) is still in the original position of the default invoice).
I've overridden the following files, but don't seem to be able to find / change the bundle product options.
Magento\Sales\Model\Order\Pdf\Invoice.php
Magento\Sales\Model\Order\Pdf\Items\Invoice\DefaultInvoice.php