Hey Lorraine

Thank you for posting in the Lucid Community! While invoices are always available for account owners and billing admins to view and download through the Plans & Billing section Lucid Software customers on monthly plans must opt-in to receive their invoices by email (annual plans should receive invoices by email automatically). For more information on this check out this Community Post and let me know if you have any questions! 

Hope this helps--If not please reach out to us directly at support@lucidchart.com. We would be happy to help! Cheers