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Hi,

I'm trying to better understand how invoice attachments work. I've been exploring the "Add attachment" endpoint, and while I've been able to use it to add attachments that then appear under the "attachments" key when retrieving an invoice via "Get Invoice," I've noticed a couple of gaps in the documentation:

• The "Add attachment" endpoint itself has very limited documentation.
• The "Get Invoice" endpoint's response documentation doesn't mention the "attachments" key at all.

This leads to a couple of questions:

1. Beyond using the "Add attachment" endpoint, are there any other methods for attaching documents to an invoice (e.g., through the transmission network)?
2. What types of business documents or use cases is this attachment field primarily designed for?

Any insights you can share would be greatly appreciated!

Thanks!