Get file attributes in Supermodel
<sm:asset var="_file" name="download" field="file"/>
<sm:if name="_file">
<sm:set var="_filename" name="download" field="name"/>
<sm:ifNot name="download" field="name">
<sm:set var="_filename" value="${_file.file.name}"/>
</sm:ifNot>
<a href="<sm:out name="_file" field="url"/>"><sm:out name="_filename" /> (${_file.fileSizeString} ${_file.suffix})</a>
</sm:if>