Update controller method not rendering json data in Laravel - forms

Question

I have a simple form with some text inputs and uploading photos with that form. Store method working very well but I'm doing something wrong in update method.
This is my store method which works fine:
public function store(Request $request)
{
dd($request);
$post = new Post;
$post->title = $request->title;
$post->user_id = $request->user()->id;
$post->who = $request->who;
$post->when = $request->when;
$post->where = $request->where;
$post->body_text = $request->body;
$post->embed = $request->embed;
$post->status = "4";
$post->tags = $request->tags;
$post->slug = "asdasd";
$post->ip = request()->ip();
if($request->hasfile('photo'))
{
foreach($request->file('photo') as $image)
{
$name= time()."".$this->photo_san($image->getClientOriginalName());
$image->move(public_path().'/uploads/', $name);
$data[] = $name;
}
$post->photo = json_encode($data);
}
$post->save();
$post->slug = $post->id."-".$this->make_slug($request->title);
$post->save();
Session::flash('success', 'Well done.');
return redirect()->route('archive');
}
And this is my update method which saves everything but photos:
public function update(Request $request, $id)
{
if(Auth::user()->role == 3 || Auth::user()->id == Post::find($id)->user_id){
$post = Post::find($id);
$post->title = $request->title;
$post->user_id = $request->user()->id;
$post->who = $request->who;
$post->when = $request->when;
$post->where = $request->where;
$post->body_text = $request->body;
$post->embed = $request->embed;
$post->status = "4";
$post->tags = $request->tags;
$post->slug = $id."-".$this->make_slug($request->title);
$post->ip = request()->ip();
if($request->hasFile('photo'))
{
foreach($request->file('photo') as $image)
{
$name= time()."-edit-".$this->photo_san($image->getClientOriginalName());
$image->move(public_path().'/uploads/', $name);
$data[] = $name;
}
$post->photo = json_encode($data);
}
$post->save();
Session::flash('success', 'Well done.');
return redirect()->route('new');
}
else
Session::flash('error', 'Shame on you :( ');
return redirect()->route('new');
}
When I'm updating any post, everything updating but photos and I don't have any idea what's wrong.
I don't know if it differs but I'm using Laravel 5,8