How to return view with flash message?

It looks like you're mixing two different ways of passing data to a view, which I'm guessing is the problem. The documentation seems to indicate it's a one or the other type situation. You also seem to be mixing up view()->with() and redirect()->with(), which work differently. Try this:

return view('protected.standardUser.includes.documents')->with('documents', $documents)->with('successMsg','Property is updated .');

And

@if(!empty($successMsg))
  <div class="alert alert-success"> {{ $successMsg }}</div>
@endif

I order to use session stored flash messages, need to use following code into route method.

 $request->session()->flash('successMsg','Saved succesfully!'); 

and then do

 @if(Session::has('successMsg'))
    <div class="alert alert-success"> {{ Session::get('successMsg') }}</div>
  @endif

that's it