What are common troubleshooting steps if a `wrangler deploy` update fails or doesn't behave as expected?

If a `wrangler deploy` update fails: 1. **Review Wrangler Output:** Check the console for detailed error messages. 2. **Verify `wrangler.toml`:** Ensure all configurations (e.g., account_id, worker name, routes, bindings) are correct. 3. **Environment Variables:** Confirm that all necessary shell environment variables or `.env` files are correctly set. 4. **Cloudflare Dashboard:** Check your Worker's logs and status in the Cloudflare dashboard. 5. **Authentication:** Re-authenticate using `wrangler login` or verify your API token's validity. 6. **Local Testing:** Test your Worker locally with `wrangler dev` to isolate issues before deployment.