{{ $dataName := .Get "data" }}
{{ $baseDir := path.Dir .Page.File }}

<ul>
  {{ range (index .Site.Data (split $dataName "/")) }}
    {{ $filename := (path.Join $baseDir .filename) }}
    {{ $file := os.Stat $filename }}
    {{ if $file }}
      <li><a href="{{ $filename | absURL }}">{{ .title }} ({{ div (div $file.Size 1024) 1024 }} MB)</a><br/>{{ .comment }}</li>
    {{ end }}
  {{ end }}
</ul>