PDF Invoice bank transfer

Hello,

I want to let my customers pay through bank transfer. When I enable this and someone uses this payment method the order goes to ‘On Hold’. Then when they pay I change it to ‘In progress’ and then they receive an e-mail. But normally when someone pays directly the pdf invoice comes in ‘My account’ at ‘Orders’. But when I manually change it from ‘On hold’ to ‘In progress’ there is no invoice to download at my orders? How can I fix this?