Although I haven't tried it, the documentation says that you can use a filehandle with the put method, so after you login, you should be able to
$ftp->put(DATA, $remotefile);

[download]
You might also be able to use IO::Scalar to send a string as if it were a file handle. Whether either of these would work with a given compliler, shrug!

In reply to Re: Net::FTP Question by Thelonius
in thread "Compile" Net::FTP upload script and use __DATA__ ? by OverlordQ

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