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Hi @iasmina,
Depending on your payment methods setup, the first email sent to your customers could be the Order on-hold (manual payments, direct bank transfer, check payments, cash on delivery, etc.) or Processing order (automatic payments, e.g. PayPal, Stripe, etc.) email notifications, therefore, you can check both options in your Attach to, so you can make sure your customers receive the PDF invoices automatically in any case.