Uploading files to uploads.sh and embedding in GitHub

What this does and why

GitHub's native image hosting (github.com/user-attachments/…) is reachable from a browser session and, since GitHub CLI 2.99 (September 2026), from gh … --attach on an existing PR or issue with push access. There is still no public REST endpoint, and the hosted file is private to GitHub. Any other image URL you put in a PR/issue body written with gh … --body-file must already point at something publicly hosted. The github-screenshots skill says when gh --attach alone is enough.

This skill covers both transports: the uploads CLI (local files, git, localhost) and the hosted MCP at https://agents.uploads.sh/mcp (bytes you already have, or a public HTTPS URL to fetch, no checkout). Both PUT to the uploads.sh API and return a stable public URL plus ready-to-paste markdown. For PRs and issues the managed attachments comment is available on both. The CLI can fall back to local gh. Hosted MCP is bot-only.