upload PDF file into Application server

Hi Team,

i have a requirement as to upload pdf letter content into Application server.

i have seen many blocks but most of the place it is suggested to use GUI_UPLOAD FM to use.

but i dont want to pick the file from background.

Please suggest me how to generate spool to use CONVERT_ABAPSPOOLJOB_2_PDF FM.

As we have one webdynpro application and in that application smartform gets converted into PDF.

Can u please suggest some solution to upload PDF into application server as this is very urgent issues.

Thanks in Advance,