My interpretation of Apterigo's problem is that he does not need to use ftp. He could simply use the file upload feature of CGI.pm which is built into modern versions of Perl. This type of file upload uses http, not ftp.

Once the file is uploaded his form handler can test to see if the uploaded file is binary, move it based on the file type, and so on. The CGI.pm documentation provides the following example of how to move an uploaded file:

    # Copy a binary file to somewhere safe
    open (OUTFILE,">>/usr/local/web/users/feedback");
    while ($bytesread=read($filename,$buffer,1024)) {
       print OUTFILE $buffer;
    }
[download]

I have never used Net::FTP, but I suspect its use would be overkill in a case where ftp is not required.