Laravel 5.5.40 file upload not working

I have downgrade laravel from 5.6 to 5.5.40 successfully.But now i have a problem.Before downrading laravel input file was working,now it's not working.When i write '$request->file('image')' it return null.I have set 'enctype' but still is not working.The same form was working with laravel 5.6 ! Only input with type="file" is not working.Is there any one that can help me ?? Thanks !!

via Chebli Mohamed