<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def preview(file):
 """Return appropriate template and pass the file and an embed flag."""

    tree, limit_reached, error = make_tree(file)
    list = children_to_list(tree)['children']
    return render_template(
        "invenio_previewer/zip.html",
        file=file,
        tree=list,
        limit_reached=limit_reached,
        error=error,
        js_bundles=current_previewer.js_bundles + ['previewer_fullscreen_js'],
        css_bundles=current_previewer.css_bundles,
    )