Fleet manager (your role on the portal) would be able to download their PZU iFlota account invoices from within the system.
Please navigate to Dashboard -> Company profile -> Billing -> Download from where you could download your invoices.
Step 1 - Click on the three dots from the "Main dashboard". Then choose "Company profile".
Step 2 - Scroll down to the billing section -> click on the download icon.
Step 3 - Open the downloaded pdf file.
Contact support@vivadrive-assist.freshdesk.com if you need assistance and we will help you.