uploading files multisite

Hi guys,

I successfully setup a multisite but I have a problem with uploading files.

The situation is that when I am working in one of my subsites and I upload files, the files are not uploaded into the subsite file structure.
Instead, the files are uploaded into the parent Drupal website files folder.

I would like to keep all uploads resident in the related subsite. Is there anyway to deal with this issue.