server-tools/attachment_queue/demo/attachment_queue_demo.xml

<?xml version="1.0" ?>
<odoo noupdate="1">

        <record id="attachment_queue_demo" model="attachment.queue">
            <field name="datas">bWlncmF0aW9uIHRlc3Q=</field>
            <field name="name">attachment_queue_demo.doc</field>
        </record>

</odoo>