gh-upload

gh cannot attach files. POST https://uploads.github.com/user-attachments/assets can — it is the endpoint behind drag-and-drop in the web UI. No browser, no computer use.

Assets inherit repo visibility: upload against a private repo and the URL 404s for anyone without access. That is the reason to prefer this over an external host for anything going into a GitHub body.

1. Get the numeric repo id

REPO_ID=$(gh api repos/{owner}/{repo} --jq .id)   # e.g. 169221790

It must be the numeric id. gh repo view --json id returns a GraphQL node id (MDEwOlJlcG9zaXRvcnkx…) — that 404s.

2. Upload