Mongodb – Why am I getting 'req.body undefined' when trying to push a new nested array in an array through update request in Node.js?

Actually I am trying to push a new nested array inside an array through update request for an API. I am using all necessary middleware such as app.use(express.json()) and app.use(express.urlencoded({extended: true})); and also the multipart/form-data in the postman header but still I am getting the req.body undefined.

Below is the Update request code

const Update =async (req,res)=>{
    const _id = req.params.id
    const {Episodes} = req.body

    try{
        const UpdatedPodcast = await Podcasts.updateOne({
            _id
        },
        {
            $push:{
                Episodes:[{
                    Episodes
                }]
        }
        },
        {
            upsert:true,
            new:true
        }
        )
        console.log(Episodes)
        // console.log(data)
        res.send(UpdatedPodcast)
    }catch(err){
        res.status(500).json({
            message:"Error in updating the data"
        })
        console.log(err)
    }
}

Below is the schema for API data

const mongoose = require('mongoose')

const PodcastSchema = new mongoose.Schema({
        CategoryName:String,
        Episodes:[
            {
                EpisodeNo:Number,
                EpisodeName:String,
                EpisodeDescription:String,
                imageurl:String
        }
        ]
    },
    {
        timestamps:true
    })

module.exports = mongoose.model('PodcastSchema',PodcastSchema)

Below is the screenshot of POSTMAN request

I have tried to access the Episodes array through different method but still getting req.body undefined. Can someone help me to find solution to this problem.