post https://api.apicbase.com/api/v2/invoices//files
Uploads a single invoice file to a specific invoice.
This endpoint allows you to attach a single new file to an existing invoice record. This is useful for adding the primary invoice document or supplementary files such as supporting documentation, or other relevant materials.
You can specify whether the file is the primary invoice document or a supplementary file via the file_type parameter.
The request must use the multipart/form-data content-type.
This request does not trigger the content extraction process.
This request simply attaches a file to an existing invoice record. The invoice record won't automatically populate with data from the file, nor will any purchase orders be linked to it.