[support] uploading files added _0 no duplicate file

[Jim Ruby]

Hi, I am using filefield sources and I am copying a file from a folder on
the server to drupal and it is adding an _0 to the file, there is no
duplicate file name in the sites/default/files folder. I've looked in the
forums and even posted in the filefield sources issues to see what might be
causing this?
Anyone else encountered this or know of a fix or help on trying to resolve
this?

Thanks.