Your deployments are completing normally, so the GitHub connection itself is working. The "could not load branches" error in the branch picker is a stale cache or permissions sync issue. To resolve it: open your GitHub App installation settings, confirm the Railway app has access to the affected repos and accept any pending permission updates, then back in Railway go to your service settings and disconnect and reconnect the repository. You can also force a cache refresh by clicking Add > GitHub Repository > Refresh on the project canvas. If the error persists after those steps, uninstalling and reinstalling the Railway GitHub App from GitHub is the definitive fix.