Hi Karin,

If you have DocStore enabled in AP, it should do it automatically. Go to Edit>Banks and look at the Specifications tab to see what spec form is selected in the "DocStorage Form" box. That is what will be saved and linked to the payment.
Also, in the most current version of AP, you can go Inquiries>System Check Runs, select the check run you want and click the Add. Forms button to resend those payment advices if needed.