Keeping uploads through form errors with attachment_fu?

I’m using attachment_fu. If the user submits a form with a file
attachment and validation fails for some reason not related to the
attachment, he is currently forced to choose and upload the file again.
Is there a way to avoid this?

The old FileColumn (
http://www.kanthak.net/opensource/file_column/index.html ) solves this
according to a comment I’ve read in
For Attaching Files, use Paperclip
I wonder if it’s possible to achieve the same with attachment_fu.

xavi