All users should confirm with their bank the specific instructions on how to upload your BPay file for processing.
As a start, you can find relevant information here:
•ANZ www.anz.com.au/support/internet-banking/pay-transfer-business/multiple-pay-anyone/import-file/
•COMMBANK www.commbank.com.au/content/dam/commbank/business/pds/003-279-importing-a-de-file.pdf
•NAB www.nab.com.au/content/dam/nabconnectcontent/nab-connect-help/quick-reference-guides/upload-and-process-financial-files.pdf
•WESTPAC www.westpac.com.au/business-banking/online-banking/support-faqs/importing-payment-details/