how to upload optional documents - laravel

Question

I need to upload few files optional. here I add code
<form action="{{ route('UserConfirmation', app()->getLocale()) }}" enctype="multipart/form-data" method="post">
<div class="form-group form-control">{{ csrf_field() }}
<input type="tel" name="ContactNo" value="{{ old('ContactNo') }}" required>
<input class="form-control" type="file" name="nic" required><br>
<input class="form-control" type="file" name="BillingProof" ><br>
<input class="form-control" type="file" name="CashSlip" ><br>
<input class="btn btn-primary" type="submit" name="submit" ><br>
</div>
</form>
here is two required fields, and others are not require,so I need those save in database as empty, here i add my current controller.
public function store(Request $request)
{
//dd($request);
$validator = Validator::make($request->all(), [
'ContactNo' => ['required', 'string','max:15'],
]);
if ($validator->fails()) {
return redirect()->back() ->withErrors($validator)->withInput();
}
$nicPath = $request->file('nic')->store('public');
$billPath = $request->file('BillingProof')->store('public');
$CashSlipPath = $request->file('CashSlip')->store('public');
$UC = $request->all();
$UserCon= new UserConfirm();
$UserCon->ContactNo = $UC['ContactNo'];
$UserCon->NIC = str_replace('public/', '', $nicPath );
$UserCon->BillingProof = str_replace('public/', '', $billPath );
$UserCon->CashSlip = str_replace('public/', '', $CashSlipPath );
$UserCon->Status = "none";
$UserCon->Remark = "none";
$UserCon->save();
Session::flash('UserConfirm','We recived your Documents and we are working on it');
return redirect()->route('feedback',app()->getLocale());
}
and also I add nullable attribute to table fields. here i attach image of table

Answer 1

You should check if the file has been sent at first:
$billPath = $request->hasFile('BillingProof') ? $request->file('BillingProof')->store('public') : null;
$CashSlipPath = $request->hasFile('CashSlip') ? $request->file('CashSlip')->store('public') : null;
and then save it into your storage.