You can download invoices only if you are the owner of your team.
Read more about the different levels of permission here.
To download your invoice in the app, you can follow these steps:
Click on your name on the bottom left of your screen
Click on the name of your team
Click on the "Plan & Billing" tab
Click on "Manage Subscriptions"
Click on "Billing History"
Download the invoices
If you need your invoices after churning or have other questions, please email firstname.lastname@example.org.