Check if the following two things are valid in your script:

1. Your generated HTML form source must be multipart: <form ENCTYPE="multipart/form-data" etc.

2. If you're uploading a binary file, call the binmode(OUTFILE); function (example):

  open (OUTFILE, ">>$file_path");

  binmode(OUTFILE);
  
  while($bytesread=read($file_name, $buffer, 1024)) 
  {
    print OUTFILE $buffer;
  }
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