Update Upload.tsx

frontend/src/upload/Upload.tsx

@@ -1,4 +1,4 @@
-import React, { useRef } from 'react';
+import React from 'react';
 import { useCallback, useEffect, useState } from 'react';
 import { useDropzone } from 'react-dropzone';
 import { useDispatch } from 'react-redux';