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<form action="https://<address>/cgi-bin/upload.pl" method="post" encty
+pe="multipart/form-data"> 

...
<input type="File" name="FILE10" size="40"> 

<input type="Submit" value=" Upload " >  <input type="reset" value=" R
+eset ">

my $url = 'https://<address>/cgi-bin/upload.pl';
my $response = $browser->post($url,Content_Type => 
"multipart/form-data" Content => [file => ['data.txt']]);
print ($response->status_line);