server-tools/attachment_synchronize/views/attachment_queue_views.xml

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

    <record id="view_attachment_queue_form" model="ir.ui.view">
        <field name="model">attachment.queue</field>
        <field name="inherit_id" ref="attachment_queue.view_attachment_queue_form" />
        <field name="arch" type="xml">
            <!-- Add Related Task and Backend -->
            <xpath expr="//field[@name='url']" position="after">
                <field name="method_type" invisible="1"/>
                <field
                    name="task_id"
                    domain="[('method_type', '!=', 'import')]"
                    attrs="{'required': [('file_type', '=', 'export')], 'readonly': [('method_type', '=', 'import')]}"
                />
                <field name="storage_backend_id"/>
            </xpath>
        </field>
    </record>

    <record id="view_attachment_queue_tree" model="ir.ui.view">
        <field name="model">attachment.queue</field>
        <field name="inherit_id" ref="attachment_queue.view_attachment_queue_tree" />
        <field name="arch" type="xml">
          <xpath expr="//tree" position="attributes">
              <attribute name="decoration-muted">state == 'done'</attribute>
          </xpath>
          <xpath expr="//field[@name='file_type']" position="after">
              <field name="task_id"/>
              <field name="storage_backend_id"/>
          </xpath>
        </field>
    </record>

</odoo>