storage_thumbnail/views/storage_thumbnail_view.xml
<?xml version="1.0" encoding="utf-8"?>
<odoo>
<record id="view_thumbnail_form" model="ir.ui.view">
<field name="model">storage.thumbnail</field>
<field name="arch" type="xml">
<form string="Thumbnail">
<group>
<field name="url_key" />
<field name="size_x" />
<field name="size_y" />
</group>
</form>
</field>
</record>
<record id="view_thumbnail_tree" model="ir.ui.view">
<field name="model">storage.thumbnail</field>
<field name="arch" type="xml">
<tree string="Thumgnail">
<field name="name" />
<field name="url_key" />
<field name="size_x" />
<field name="size_y" />
</tree>
</field>
</record>
</odoo>