Welcome aboard to the QuickBooks Community. I'm here to help make sure you'll get the support you need with the order concern.
If you're using the Bill.com app and wants to view the order attachments, you'll need to reach out to their Customer Support. You can reach out to them by logging into your Bill.com account and clicking Support from the bottom of any page.
You can visit the link below and follow the detailed instructions on how to reach them: