whatsapp_web_groups/custom_sat_connection/views/ir_attachment.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>

        <record id="sat_connection_ir_attachment_list" model="ir.ui.view">
            <field name="name">sat_connection_ir_attachment_list</field>
            <field name="model">ir.attachment</field>
            <field name="inherit_id" ref="data_cleaning.view_data_storage_attachment_tree"/>
            <field name="arch" type="xml">

                <xpath expr="//field[@name='name']" position="before">
                    <header>
                        <button name="download_massive_zip" string="Descargar zip" class="btn btn-primary" type="object"/>
                    </header>
                </xpath>

            </field>
        </record>

    </data>
</odoo>