Enregistrer FormData avec Upload de Fichier dans Angulaire 5

Je suis en train d'enregistrer des fichiers avec FormData Angulaire 5.
Je peux obtenir le fichier unique, mais n'ont aucune idée de comment récupérer tous les fichiers téléchargés.
J'ai trois fichiers image et les champs de saisie, essayé de chercher des exemples. Mais seulement obtenu pour plusieurs de téléchargement de fichiers.
Je veux télécharger chaque fichier unique à partir de ce formulaire.

Ci-dessous mon code :

JS:

import { Component, OnInit, ViewEncapsulation } from '@angular/core';
import { Location } from '@angular/common';
import { ActivatedRoute } from '@angular/router';
import { Category } from '../../../shared/services/categories/category';
import { CategoriesService } from '../../../shared/services/categories/categories.service';

@Component({
  selector: 'app-add-category',
  templateUrl: './add-category.component.html',
  styleUrls: ['./add-category.component.scss'],
  encapsulation: ViewEncapsulation.None
})
export class AddCategoryComponent implements OnInit {
  
  category: Category = new Category();
  fileToUpload: File = null;
  
  constructor(
    private categoriesService: CategoriesService,
    private route: ActivatedRoute,
    private location: Location  
  ) { }

  ngOnInit() {
  }

  goBack(): void {
    this.location.back();
  }

  handleFileInput(files: FileList) {
    console.log(files);
  }

  addCategory() {
    console.log(this.category);
    this.categoriesService.createCategory(this.category).subscribe(() => this.goBack());
  }

}

HTML:

          <h3 class="box-title">Category</h3>
<form role="form" (ngSubmit)="addCategory()" #categoryForm="ngForm">
<div class="box-body">
<div class="row">
<div class="col-lg-6">
<label for="Category Name">Name</label>
<input type="text" class="form-control" [(ngModel)]="category.category_name" name="category_name" id="category_name" placeholder="Enter Category Name" required="">
</div>
<div class="col-lg-6">
<label for="Category Path">Path</label>
<input type="text" class="form-control" [(ngModel)]="category.category_path" name="category_path" id="category_path" required="">
</div>
</div>
</div>
<br/>
<div class="form-group">
<label for="Category Description">Description</label>
<textarea rows="3" [(ngModel)]="category.category_description" name="category_description" id="category_description" class="form-control" required=""></textarea>
</div>
<div class="col-lg-12 text-center">
<input type="file" [(ngModel)]="category.category_banner" (change)="handleFileInput($event.target.files)" class="custom-file-input" name="category_banner" id="category_banner">
<label class="custom-file-label" for="customFile">Banner</label>
</div>
<br/>
<div class="form-group">
<label for="Category Banner Code">Banner Code</label>
<textarea rows="3" [(ngModel)]="category.category_banner_code" name="category_banner_code" id="category_banner_code" class="form-control" required=""></textarea>
</div>
<br/>
<div class="col-lg-12">
<input type="file" [(ngModel)]="category.category_image" (change)="handleFileInput($event.target.files)" class="custom-file-input" name="category_image" id="category_image">
<label class="custom-file-label" for="customFile">Image</label>
</div>
<br/>
<div class="col-lg-12">
<input type="file" [(ngModel)]="category.category_icon" (change)="handleFileInput($event.target.files)" class="custom-file-input" name="category_icon" id="category_icon">
<label class="custom-file-label" for="customFile">Icon</label>
</div>
<div class="form-group">
<label for="Category Meta Title">Meta Title</label>
<input type="text" [(ngModel)]="category.category_meta_title" class="form-control" name="category_meta_title" id="category_meta_title" placeholder="Enter Meta Title" required="">
</div>
<div class="form-group">
<label for="Category Meta Description">Meta Description</label>
<input type="text" [(ngModel)]="category.category_meta_decription" class="form-control" id="category_meta_description" name="category_meta_description" placeholder="Enter Meta Description" required="">
</div>
<div class="form-group">
<label for="Category Meta Keyword">Meta Keyword</label>
<input type="text" [(ngModel)]="category.category_meta_keyword" class="form-control" id="category_meta_keyword" name="category_meta_keyword" placeholder="Enter Meta Keyword" required="">
</div>
<div class="form-group">
<div class="row">
<div class="col">Featured :</div>
<div class="col">
<label class="radio-inline" for="Category Featured">
<input type="radio" [(ngModel)]="category.category_featured" name="category_featured" id="category_featured" value="1" required="">Yes
</label>
</div>
<div class="col">
<label class="radio-inline" for="Category Featured">
<input type="radio" [(ngModel)]="category.category_featured" name="category_featured" id="category_featured" value="0" required="">No
</label>
</div>
</div>
</div>
<input type="hidden" [(ngModel)]="category.category_status" name="category_status" id="category_status" value="1">
<div class="box-footer col-md-12">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>