Recent uploaded file deleted.

We are installed Upload File Replace (for filefield CCK) 6.x.1.2 module. We didn't see any configuration.
Created new content type "test" having one of the field is for file upload. Using this content type created a node "test1" and upload "test.pdf" file.
We edit the "test1" node and remove "test.pdf" file and again upload the new updated "test.pdf" file (test.pdf file name is used some other place). After saving node the older file changes to "test_0.pdf" at the uplaoded path but new uploaded file test.pdf is not there.

Also We got some patch for the configuration but no result as we expected.

Is there any bug or we are missing some configuration?
Please guide us.