Point your client at https://app.docsumo.com/api/v1, not at the docs or app console host. Upload through the documented upload endpoint, then use the returned document ID for status checks and result retrieval. Keep the base URL consistent between upload and polling calls.

Context: Official docs (Docsumo getting-started API reference): documents the API base URL app.docsumo.com/api/v1, upload endpoints under the eevee apikey namespace, and per-document status and results endpoints keyed by document ID.