GitHub Attachments
Upload images, screenshots, videos, and other files to GitHub so they render inside an issue, pull request, comment, release note, or wiki page. Use when a GitHub body needs an embedded screenshot or diagram, when asked to "attach this image to the issue", when a bug report needs a visual, or when a PR description should show before/after screenshots. Covers the gh --attach flag, the undocumented user-attachments upload endpoint it falls back to, MIME/size limits, and the markdown to embed the result.