Please note that this feature is only available on the paid plans. If you're on the free plan, you will need to upgrade first.
Enable the FileJar app block for the Thank You and Order Status pages by following the steps below:
Navigate to Settings > Checkout in your Shopify dashboard
In the Configurations section, click on the Customize button. This will open the Theme Editor with the Checkout page selected.
From the top dropdown menu, switch from Checkout to Thank you.
In the left Sections menu, click on Add app block and select FileJar.
You can move the app block to your preferred position on the page. Then click on the Save button in the top right corner.
Repeat the steps above for the Order Status page, by switching from Thank you to Order status in the top dropdown menu.