I don't think ECHOOooo understood oldbag66's question. The answer seems to be that WordPress has no facility for attaching files to posts unless the files in question are media files embedded in the post. Note the statement in the codex link BEGIN QUOTE They do not become "attachments" until you actually Insert them into the post. Therefore, it is a misnomer to call them attachments; it may be more accurate to call them "embedded files." END QUOTE
One can upload any file to the wp-content/uploads directory, using either the wp-admin interface or an ftp client, and then provide a link to this file in the post, but WordPress 2.7.1 doesn't provide any way (that I have found) to mark the file as "attached to" the post. You've got to know the URL to the file and code it into the post.
If you use an ftp client to upload, WordPress doesn't know that the file is in the "Media" library--it won't show in the list. This is no problem as long as you use the ftp client to show what files and directories are in wp-content/uploads/.
Note also that uploading files using the wp-admin interface forces file names to all lower-case, so you need to write URLs accordingly in your links.