Uploading multiple dynamic files to laravel from vue

I'm trying to upload multiple files with it's respective data from vue to laravel. I'm getting the files in vue (on vue console) but when submitting the form and doing dd($request['new_members']); on the laravel controller, it returns the result below:

The other data is available but the file value is gone.

Vue

<div class="row mt-2" v-for="(new_member,index) in new_members" :key="index">
    <div class="col-md-4">
        <label>NAME</label>
        <input class="form-control" type="text" v-model="new_member.name" required/>
    </div>
    <div class="col-md-4">
        <label>POSITION</label>
        <input class="form-control" type="text" v-model="new_member.position" required/>
    </div>
    <div class="col-md-4">
        <label>IMAGE</label>
        <input type="file" @change="onFileChange(index,$event)" name="file" ref="fileInput" required/>
    </div>
</div>
<button class="btn btn-primary col-md-2 col-12 rounded-0 float-right"  @click.prevent="addMoreMember()">ADD MORE</button>

<script>
data(){
    return{
        new_members:[{
            name:'',
            position:'',
            file:''
        }]
    }
},
methods:{
    addMoreMember(){
        this.new_members.push({name:'',position:'',file:''})
    },
    onFileChange(index,$event) {
        this.new_members[index].file =  $event.target.files[0]
    },
    submit(){
        let form = new FormData()
        form.append('new_members',JSON.stringify(this.new_members));
        form.append('content_team', this.content_team);
        axios.post('/api/mainpage/addNewMember',form).then(res=>{

        }) 
    },
}
</script>