It sounds like you're experiencing a connection issue while trying to assign a model to a draft. Here are a few steps you can try to resolve the issue:
1. **Check Your Internet Connection**: Ensure your internet connection is stable and try again.
2. **Clear Cache and Cookies**: Sometimes clearing your browser’s cache or cookies can resolve unexpected issues.
3. **Refresh the Page**: Try refreshing the page and attempting the action again.
4. **Try a Different Browser or Device**: There may be an issue with the browser you are using. Try using a different browser or device to see if that resolves the problem.
5. **Check for Service Outages**: If the issue persists, verify whether there is an ongoing outage or maintenance with the platform you're using.
If none of these steps work, consider reaching out to the platform's support team for further assistance.