The Attachments webpart Displays a list of ALL CMS.File documents that are located under the document containing the web part in the content tree.
Probably best to use a basic Repeater (in Kentico 9 it is already a basic Kentico CMS Repeater).
Here you can set the Path property: /Support/% and page type CMS.File
In the Transformation use something like
<a target="_blank" href="<%# GetFileUrl("FileAttachment") %>">
<%# IfImage("FileAttachment", GetImage("FileAttachment", 400, 400, 400, Eval("FileDescription")), "")%>
<br /><%# Eval("FileName",true) %></a>
to show the attachments under this document.