400 Bad Request while uploading file in Altair using graphql and apollo

400 Bad Request while uploading file in Altair using graphql and apollo here is my code when I send a request to the server only in uploading file I get this kind of error: is there any way I could upload a file without getting this error

const {  gql } = require('apollo-server-express');

  
export default gql`
   scalar Upload
   type User{
    id: Int! 
    firstName: String!
    lastName:  String!
    userName:  String! 
    email:     String! 
    createdAt: String!
    updatedAt: String!
    bio:       String
    avatar:    String

   }
   type loginResult{
    ok:    Boolean!
    token: String
    Error: String

   }
   type editProfileResult{
    ok: Boolean!
    Error: String
   }
   type Mutation{
    creatUser(
        firstName: String!
        lastName:  String!
        userName:  String! 
        email:     String! 
        password:  String!
    
    ):User
    logIn(userName: String!, password: String!):loginResult!
    editProfile(firstName: String
        lastName:  String
        userName:  String
        email:     String 
        password:  String
        bio:        String
        avatar:    Upload ):editProfileResult!
   }