Hi,
So I've checked the issue on your website backend and you don't have a display issue for that custom field in the B3R8 order.
You don't see any file listed in the custom field on the order details page because there are no files listed in the database for that address.
What I'm trying to say is that your issue is not with the display of the files there. The issue is apparently during the saving of the address where the custom field files are ignored instead of being added in the database.
So I've looked around and I was able to reproduce the issue when editing an address from a user in the backend interface. I've made another patch for this, which I've added to both the install package on our website and your website with the FTP access you provided.
Now, this won't change anything for the orders / addresses you already have since they don't have the field filled.
To test that it works, you'll have to try again from the start, with a new address (or edit an existing one).
Hopefully, everything should be fine now.