File "" does not exist error in Laravel Excel

When I try to upload excel file in the server it shows this error. My php version is 7.2.33 and using maatwebsite/excel version "3.1.23"

Here is my controller code:

	$this->validate($request, [
            'employee_list'  => 'required|mimes:xlsx,xls',
            'corporate_id'  => 'required',
        ]);
        $file = $request->file('employee_list');
        $import =  new EmployeeImport($request->corporate_id);
        $import->import($file);
        if ($import->failures()->isNotEmpty()) {
            return back()->withFailures($import->failures());
        }

Here is EmployeeImport file code

class EmployeeImport implements ToModel,WithHeadingRow,SkipsOnError,WithValidation,SkipsOnFailure,WithBatchInserts,WithChunkReading
{
    use Importable,SkipsErrors,SkipsFailures;
    private $corporate_id;
    public function __construct($corporate_id)
    {
        $this->corporate_id = $corporate_id;
    }

    /**
    * @param array $row
    *
    * @return \Illuminate\Database\Eloquent\Model|null
    */
    public function model(array $row)
    {
        return new CorporateEmployee([
            'phone_no' => $row['phone_number'],
            'company_id' => $this->corporate_id
        ]);
    }

    public function rules(): array
    {
        return [
            '*.phone_number' => ['regex:/(01)[0-9]{9}/','unique:corporate_employees,phone_no']
        ];
    }

    public function batchSize(): int
    {
        return 100;
    }

    public function chunkSize(): int
    {
        return 100;
    }


}

I have also used

enctype="multipart/form-data"

in the input form.

I am also getting the file name in the request

corporate_id 	

"4"

Files
employee_list 	

array:5 [▼
  "name" => "Employee1.xlsx"
  "type" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
  "tmp_name" => "/tmp/phpXboDe5"
  "error" => 0
  "size" => 8593
]