Remove content-type as it causes the failure of formdata pass

frontend/src/utils/backend/axios.js

@@ -2,10 +2,7 @@ import axios from 'axios'
 import { jwtDecode } from 'jwt-decode'
 
 const backendAxios = axios.create({
-  baseURL: '',
-  headers: {
-    'Content-Type': 'application/json'
-  }
+  baseURL: ''
 })
 
 // Function to check if the token has expired