WWW::Mechanize gives corrupted uploaded file name - perl

Question

I have some weird problem while uploading a file with a Cyrillic name using WWW::Mechanize. The file is uploaded correctly but the name is broken (I see only ?????? on the target site).
The code is simple:
use WWW::Mechanize;
use Encode qw(from_to);
my $config = {
login => "login",
password => "pass",
source_folder => "$Bin/source_folder",
};
my $mech = WWW::Mechanize->new( autocheck => 1 );
$mech->agent_alias("Windows IE 6");
$mech->get("http://www.antiplagiat.ru/Cabinet/Cabinet.aspx?folderId=689935");
authorize($mech);
$mech->submit_form(
form_number => 1,
fields => {},
button =>
'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$FolderControl_StdFolder_0$DocumentsGrid$btnAddItem',
);
find( \&wanted, $config->{source_folder} );
sub wanted {
return unless -f;
say $config->{source_folder} . "/" . $_;
#from_to($_, "CP1251", "UTF8"); doesn't work too :-(
my $mech = $mech->clone();
$mech->submit_form(
form_number => 1,
fields => {
'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$fuDocumentUpload' =>
$config->{source_folder} . "/" . $_,
},
button => 'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$btnCommitUpload',
);
}
If I encode the file name from CP1251 to UTF8 then the upload doesn't work. Please help me to find a solution.

Answer 1

Here is solution I use:
my $filename = $_;
from_to( $filename, "CP1251", "UTF8" );
my $mech = $mech->clone();
my $form = $mech->form_number(1);
$mech->field( 'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$fuDocumentUpload',
$config->{source_folder} . "/" . $_ );
$form->find_input(
'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$fuDocumentUpload')->filename($filename);
$mech->submit_form(
form_number => 1,
button => 'ctl00$ctl00$Body$MainWorkSpacePlaceHolder$btnCommitUpload',
);