"The file \"4340USB11.pdf\" was not uploaded due to an unknown error."

$product = Product::findOrFail($id); $candidate = [ 'name_ar' => $request->name_ar, 'name_en' => $request->name_en, 'text_desc_ar' => $request->text_desc_ar, 'text_desc_en' => $request->text_desc_en, 'price' => $request->price, 'offer' => $request->offer, 'ratio' => $request->ratio, 'end_at' => $request->end_at, 'subcat_id' => $request->subcat_id, 'order' => $request->order, 'new_price' => $request->new_price, 'software' => $request->software, 'software2' => $request->software2, 'software3' => $request->software3 ]; $fileName = $file->getClientOriginalName(); $file->move(base_path('en/files/product1'), $fileName); } if ($request->file('pdf') == ' ') { $product->file = ''; } $data1 = array_merge($candidate, ['file' => $fileName]); $update = $product->update($data1);