Dsp file uploading error

Hello experts,

I need to upload file from a DSP page, I have created:

  1. a DSP page with form that sends data to upload.dsp page
  2. upload.dsp page that calls IS service to handle the file

I can see in the pipeline name of the file, but content is coming.

3)but how to catch that content into the is service.i tried with string but it is not working.
4) I have reloaded package, but I still do not see any change
please help how we will catch the content into the string or anything.