How to fix blank PDF file sent using https.put in a SuiteScript?

Hi,

I am new to suitescript and want to implement https.put() to upload a binary file (pdf, docx, image) based on either the file_id from file cabinet or actual file selected by user from his/her computer to upload. In any case, currently when I upload a pdf, a blank pdf is created on the target server. Could you please guide me the steps to follow? Here is the code I wrote

var fileObj = file.load({

             id: bm_fileid

         });

var putreq_headers = {};

putreq_headers['Content-Type'] =  'application/pdf';

var filecontent = fileObj.getContents();

      var filebase64 = encode.convert({

       string: filecontent,

   inputEncoding: encode.Encoding.BASE_64,