Net::SFTP::Foreign has a debug mode you can enable adding the following line at the beginning of the script: 
$Net::SFTP::Foreign::debug = -1;

[download]
Enable it and then post here the output (though, you should take care to remove passwords or any other sensible information from the output)

In reply to Re: Net::Sftp::Foreign writes empty files to FTP server by salva
in thread Net::Sftp::Foreign writes empty files to FTP server by Bloehdian

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