the box of file uploader stay

## Describe the bug

when enable file query, click open file uploader

## To Reproduce

Steps to reproduce the behavior:
1. Go to answer tab and then type hello press generate to let model loaded
2. Click on enable file query and click open file uploader, you will see black box
3. upload file .pdf example from anywhere, drag to the box
4. You will see the black box is still there cannot disappear

## Expected behavior

A clear and concise description of what you expected to happen.

## Screenshots

If applicable, add screenshots to help explain your problem.

## Environment (please complete the following information):

- OS: Windows 11 Pro 23H2
- GPU: Intel Arc Graphics
- CPU: Intel(R) Core(TM) Ultra 7 165H 1.40 GHz
- Version: v1.01b-MTL-H

## Additional context

Add any other context about the problem here.