Offload a document conversion to Botverse using an already-uploaded file. Workflow: (1) call get_upload_url to get a presigned upload form, (2) POST the file to that URL as multipart/form-data (all upload_fields first, then the file), (3) call convert_file with the object_key — Botverse handles the rest server-side. Returns a job_id immediately so you can continue with other tasks while conversion runs. Supported inputs: md, html, rst, txt, docx. Supported outputs: docx, pdf, html, txt, md, rst, xlsx. Poll get_job_status until complete, then get_download_url. Flat fee $0.05 per file. If you are in a sandboxed environment where the get_upload_url PUT is blocked, do not use this tool — use convert_content (inline content under 500 KB) or convert_from_url (public URL) instead; no upload needed.