Attach images and videos on GitHub

--attach uploads a local image or video on the same command that writes an issue, pull request, or comment: gh issue create, gh issue edit, gh issue comment, gh pr create, gh pr edit, and gh pr comment.

--attach is for images and videos. Inline text in the body as a fenced code block with a language tag.

Prerequisites

1. gh auth status: if it fails, tell the user to run gh auth login.
2. gh --version: needs 2.99.0+. If older, stop and tell the user to upgrade (brew upgrade gh, or the install they use). Do not upgrade gh yourself.

Attach