Frozennode\Administrator\Fields\File::doUpload PHP Method

    public function doUpload()
    {
        $mimes = $this->getOption('mimes') ? '|mimes:' . $this->getOption('mimes') : '';
        //use the multup library to perform the upload
        $result = Multup::open('file', 'max:' . $this->getOption('size_limit') * 1000 . $mimes, $this->getOption('location'), $this->getOption('naming') === 'random')->set_length($this->getOption('length'))->upload();
        return $result[0];
    }