Corrects or adds to the request's kyb_data, and attaches documents. Never changes the status.

kyb_data is shallow-merged into what is stored — top-level keys you send overwrite or add, every other key is kept — and re-validated the way create validates it. Documents attach the same way as on create (multipart/form-data, one files_<purpose> part per document) and are appended to what that key already holds.

During pending_clarification this call alone does not return the request to review — follow it with POST /v1/requests/{id}/resubmit. See the Capability requests API guide.