Async "Objects are not valid as a React child"

I am working on a React app and am getting the following error

Uncaught Error: Objects are not valid as a React child (found: [object Promise]). If you meant to render a collection of children, use an array instead.

I know it has something to do with the async functions I'm calling under useEffect but I'm not sure how to fix it.

function App() {
  const { user, authStatus } = useAuthenticator()
  const [filesJson, setFilesJson] = useState(null);
  console.log('Status:', authStatus,'User:', user)

  
  // Move the logic here
  
  useEffect(() => {
    async function getUserFilesJson(user, bucket = 'overwatch-draft-v1') {
      const username = user?.username;
      if (!username) throw new Error('No username found');
      const { items } = await list({
        path: `${username}/`,
        options: { bucket }
      });

      const log_cycle = {};
      const status_overview = [];
      const system_settings = [];

      (items || []).forEach(item => {
        const relPath = item.path.replace(`${username}/`, '');
        const [folder, subfolder, ...rest] = relPath.split('/');
        if (folder === 'log_cycle' && subfolder && rest.length && relPath.endsWith('.json')) {
          const file = rest.join('/');
          if (!log_cycle[subfolder]) log_cycle[subfolder] = [];
          log_cycle[subfolder].push(file);
        } else if (folder === 'status_overview' && subfolder && relPath.endsWith('.json')) {
          status_overview.push(subfolder);
        } else if (folder === 'system_settings' && subfolder && relPath.endsWith('.json')) {
          system_settings.push(subfolder);
        }
      });
    }

    async function fetchFiles() {
      if (user) {
        const result = filesJson;
        setFilesJson(result);
        console.log('User files JSON:', result);
      }
    }
    fetchFiles();
  }, [user]);

I've tried taking some of the functions outside of the useEffect but it doesn't like that either. I also tried utilizing getUserFilesJson as a callable .jsx function but it didn't like that either.