Confirms that the bytes were uploaded and starts background content extraction (status becomes analyzing). Only call this after the PUT to the presigned URL has completed: the API checks that the stored object exists and has exactly sizeBytes bytes, and returns 412 PRECONDITION_FAILED until it does.

Safe to call multiple times: if the file is already analyzing or analyzed, the call does nothing and still returns ok: true. If the file is failed, calling it again retries extraction. Extraction runs after the response: Excel, CSV, plain-text and Word files are converted locally; PDFs go through OCR and images are described by an AI model. Poll GET .../uploaded-files for the result.

{
  "ok": true
}