The URL of the file is listed next to each file on the Admin File upload. You simply need to make a link to that URL using either the [url], [img] tags or just by posting the URL and relying on the built-in URL auto-linker.
One thing though, about PSD files is that they aren't by default supported by web browsers. You'll definitely want to look into converting the pics into jpg, png, or gif format if you want to include the files on the page as a link.
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