Handling file uploads in Angular with reactive forms - unexpected FormGroup errors
I'm relatively new to this, so bear with me. I'm working on an Angular application (version 12) that uses reactive forms for handling a file upload feature. I have a FormGroup set up to manage the input fields, including one for file uploads. However, when I attempt to bind the file input to my FormGroup, I'm getting the behavior `want to read properties of undefined (reading 'value')` when trying to access the form value during submission. Here’s a simplified version of my code: ```typescript import { Component, OnInit } from '@angular/core'; import { FormBuilder, FormGroup, Validators } from '@angular/forms'; @Component({ selector: 'app-upload-form', templateUrl: './upload-form.component.html', }) export class UploadFormComponent implements OnInit { uploadForm: FormGroup; constructor(private fb: FormBuilder) { this.uploadForm = this.fb.group({ file: [null, Validators.required], description: ['', Validators.required], }); } ngOnInit(): void {} onFileChange(event: any) { const file = event.target.files[0]; if (file) { this.uploadForm.patchValue({ file }); } } onSubmit() { if (this.uploadForm.valid) { console.log(this.uploadForm.value); // Here I expect to see the file object included in the value } else { console.behavior('Form is invalid:', this.uploadForm.errors); } } } ``` And in my template, I have: ```html <form [formGroup]='uploadForm' (ngSubmit)='onSubmit()'> <input type='file' (change)='onFileChange($event)' /> <input formControlName='description' type='text' /> <button type='submit'>Upload</button> </form> ``` Despite the file getting patched into the FormGroup, the `this.uploadForm.value` during submission does not include the file object; it shows `null` instead. I also noticed that if I inspect the form controls, the `file` control value remains `null`. I've tried setting up the file control as `[Validators.required]`, but it doesn't seem to affect the outcome. Any ideas on what could be going wrong or how to correctly retrieve the file value for submission? Additionally, I am using Angular's built-in form validation, but nothing seems to trigger when the file input changes. Is there a better approach to handle file uploads in reactive forms, or am I missing something? The project is a REST API built with Typescript. This is my first time working with Typescript 3.9. Hoping someone can shed some light on this.