Change PUT request to POST request to include image update - laravel

Question

I wrote a post edit method which at first consisted only of text. I did the update using a PUT request.
Now I want to include images to my posts, so I added it, and it works for my POST request of creating a post but doesn't work for my update post, when I want to change image, since PUT request doesn't support file uploads.
So now I'm stuck trying to change my update method from PUT request that only updates text to a POST request that updates both the text and an image if supplied.
This is the code I wrote so far:
public function update(Request $request, Post $post)
{
//store updated image
if($request->hasFile('image') && $request->file('image')->isValid()){
if($post->hasMedia('posts')) {
$post->media()->delete();
}
$post->addMediaFromRequest('image')->toMediaCollection('post', 's3');
}
$post->update(request()->validate([
'body' => 'required'
]));
return redirect($post->path());
}
I think that the $post->update doesn't work for the POST request. I just want to update a text if an update was given.
Using Laravel 6.
EDIT: My form layout structure (simplified)
<form action="action="/posts/{post}" method="POST">
#method('PUT')
#csrf
<div class="form-group row">
<input id="body" type="text" class="form-control" name="body" value="{{ old('body', $post->body) }}">
<input id="image" type="file" class="form-control" name="image">
<button type="submit" class="btn btn-primary">Update Post</button>
</form>
My routes:
Route::get('/posts/{post}/edit', 'PostsController#edit')->name('posts.edit');
Route::put('/posts/{post}', 'PostsController#update');

Answer 1

I tried your code and it worked fine with me , only added #csrf in form tag.
<form action="/posts/{post}" method="POST" enctype="multipart/form-data">
#csrf
#method('PUT')
<div class="form-group row">
<input id="body" type="text" class="form-control" name="body" value="{{ old('body', $post->body) }}">
<input id="image" type="file" class="form-control" name="image">
<button type="submit" class="btn btn-primary">Update Post</button>
</form>