Selectively store form elements to CRX

Hello,

I have a form with some form elements in it like textfields and a uploadFile. On submit i would like to store the text field values to  crx under usergenerated folder, but the uploaded file should not be stored  into crx. How do i specify if the upload file needs to be stored to crx or not ? . The purpose of the upload form element is that the form action is a mail and store component and the file will be emailed as an attachment.

Thank you.

Kishore