從firebase獲取數據工作，但沒有顯示在反應應用程序中

這裡我想profileImage在 post 組件中顯示圖像、名稱。一開始，當我對組件進行硬編碼時，它正在顯示。但是當我從firebasefirestore獲取數據時，它不會顯示。

我的代碼就像，

function PostView() {

const [users, setUsers] = useState([]);

useEffect(() => 
    onSnapshot(collection(db, 'users'), (snapshot) =>{
        setUsers(snapshot.docs.map(doc => ({...doc.data(), id: doc.id})))
    })
,[])

return(
    <Container>
        
            <Post>
            <PostHeader>
            {users.map(user => {
                <Details>
                    <img src="https://scontent.fcmb1-2.fna.fbcdn.net/v/t1.6435-1/p240x240/242493320_1241149729697908_2159125378599502668_n.jpg?_nc_cat=107&ccb=1-5&_nc_sid=7206a8&_nc_ohc=1t7tMDC5RpsAX9WzrMX&_nc_ht=scontent.fcmb1-2.fna&oh=266e29db20581ce3ab83ce9662817e70&oe=61A5C5AC" alt="" />
                    <span style={{marginLeft: 10}}>Profile Name</span>
                </Details>
                })}
                <span style={{fontSize: 22}}>...</span>
            </PostHeader>
            <PostImage src='https://th.bing.com/th/id/R.e634d465fc117284db4f81ecceabbf4e?rik=HeQgRgW%2blF6djQ&pid=ImgRaw&r=0' />
            <PostFooter>
                <Likes>
                    <img src="https://img.icons8.com/material-outlined/24/000000/filled-like.png"/>
                    <img src="https://img.icons8.com/material-outlined/24/000000/speech-bubble.png"/>
                </Likes>
                <img src="https://img.icons8.com/material-outlined/24/000000/share.png"/>
            </PostFooter>
        </Post>
       
    </Container>
  )
}

但是當我使用firestore數據時它不會顯示，

<Container>
        {users.map(user => {
            <Post>
            <PostHeader>
                <Details>
                    <img src={user.profileImage} alt="" />
                    <span style={{marginLeft: 10}}>{user.name}</span>
                </Details>
                <span style={{fontSize: 22}}>...</span>
            </PostHeader>
            <PostImage src={user.postImgUrl} />
            <PostFooter>
                <Likes>
                    <img src="https://img.icons8.com/material-outlined/24/000000/filled-like.png"/>
                    <img src="https://img.icons8.com/material-outlined/24/000000/speech-bubble.png"/>
                </Likes>
                <img src="https://img.icons8.com/material-outlined/24/000000/share.png"/>
            </PostFooter>
        </Post>
        })}
    </Container>