1) Used Constellation Application

2) Configured Attachment Control to upload a xlsx file

3) On the submission of the view in the Case Type rule triggered an Utility to read the attachment key to open the attachment and triggered pxCreateFile Activity which created a path under pxProcess system page

4) Created appropriate binary file by uploading the appropriate template file and  and in the utility mentioned in step 3 after pxCreateFile triggered pxParseExcel Activity by passing the necessary paramters, When I traced the implementation receiving "Parse failed for the uploaded file.Cannot find zip signature within the first 4096 bytes error