Uploads a document file to a specific attribute of the KYB application. Cannot upload files to a KYB that has already been processed.

Allowed attributes: incorporation_certificates, articles_of_association, legal_structures, residence_proofs, shareholders_registers, directors_registers, evidence_of_ubos, fund_evidences, proof_regulations, aml_policies, good_standing_certificate, internal_shareholder_register, power_of_attorney