preview uploaded document in react native expo

I am trying to preview document in react native but nothing previewed when i click my Upload functionbut the image preview is successfully previewed, this is my functions:

_pickDocument = async () => {        let result = await DocumentPicker.getDocumentAsync({});      console.log(result);    }   _pickImage = async () => {    let result = await ImagePicker.launchImageLibraryAsync({      allowsEditing: true,      aspect: [4, 3],    });    console.log(result) 

this is the call function to image preview and it's work fine

<Button          title="Select Image"          onPress={this._pickImage}        />        {image &&<Image source={{ uri: image }} style={{ width: 200, height: 200 }} />}

this is the document code but it does not previewed

<Button          title="Select Document"          onPress={this._pickDocument}        />

anyone have idea?