Immediately after lodgement
Save the payment and application records first
ICA's eVisa workflow says the application becomes ready for submission after the required details and documents are complete. Once the visa fee is paid, the application is automatically submitted and a receipt email is sent. citeturn900295search0
Save the receipt, application reference, payment reference and any confirmation page in one folder. These records are useful if a decision email is delayed or you need to contact ICA about the existing application.