Alrighty,

I'd really need to know if you have multiple files, but this should get you started on the right path:

## early on..
$filepath = '/dir/of/file/';

## in your foreach/while for your file
push(@files,$field6);

## later on...
$d = join("','", @files);
$d = "'" . $d . "'";
[download]

See if that works for you. You can probably just send the filenames as variables to the module though:

$file1 = '/dir/of/file/filename1.txt';
$file2 = '/dir/of/file/filename2.txt';

## then send both variables to the module:
$file1,$file2
[download]

HTH.

-techwolf