InfoPath Dev

Hi, I am having a strange problem with attachments field on a list InfoPath form. The attachments get uploaded successfully but not able to access/open any attachment uploaded by someone else, on the form. The error says "The file is corrupt or invalid". It is happening for all the file formats...

hi can anyone please tell me the Field id for the link to the file in itemmetadata.xml. any other way of finding the site to which the task belongs is also welcome.