Upload File not working !
- main.ts:
```typescript
import { graphqlUploadExpress } from 'graphql-upload';
app.use(graphqlUploadExpress({ maxFileSize: 2000000, maxFiles: 10 }));
```

- app.module.ts:
```typescript
GraphQLModule.forRootAsync({
      imports: [ConfigModule],
      useFactory: async (configService: ConfigService) => {
        return {
          ....
          uploads: false,
          ....
        };
      },
      inject: [ConfigService],
    }),
```

- file.resolver.ts:
```typescript
// import { GraphQLUpload } from 'apollo-server-express';
import { GraphQLUpload } from 'graphql-upload';

@Mutation(() => Boolean)
  async uploadFile(
    @Args({ name: 'file', type: () => GraphQLUpload })
    file: FileUpload,
  ) {
    ....
    return true;
  }
```

- in postman or insomnia
```typescript
- operation = { "query": "mutation ($file: Upload!) { uploadFile(file: $file) }", "variables": { "file": null } }
- map         = { "0": ["variables.file"] }
- 0              = file.jpeg
```

i get error message:

```
{
  "errors": [
    {
      "message": "Unknown type \"Upload\". Did you mean \"Float\"?",
      ....
    }
  ]
}
```