oca-ocb-hr/odoo-bringout-oca-ocb-hr_expense/hr_expense/static/src/views/kanban.xml

<?xml version="1.0" encoding="UTF-8"?>
<templates xml:space="preserve">
    <t t-name="hr_expense.KanbanRenderer" t-inherit="web.KanbanRenderer" t-inherit-mode="primary">
        <xpath expr="//div[hasclass('o_kanban_renderer')]" position="attributes">
            <attribute name="class" add="position-relative h-auto" separator=" "/>
        </xpath>
        <xpath expr="//div[hasclass('o_kanban_renderer')]" position="before">
            <div t-if="dragState.showDragZone" class="o_dropzone">
                <i class="fa fa-upload fa-10x"></i>
            </div>
        </xpath>
    </t>

    <t t-name="hr_expense.DashboardKanbanRenderer" t-inherit="hr_expense.KanbanRenderer" t-inherit-mode="primary">
        <xpath expr="//div[hasclass('o_kanban_renderer')]" position="before">
            <ExpenseDashboard/>
        </xpath>
    </t>

    <t t-name="hr_expense.KanbanView" t-inherit="web.KanbanView" t-inherit-mode="primary">
        <xpath expr="//button[hasclass('o-kanban-button-new')]" position="before">
            <input type="file" name="ufile" class="d-none" t-ref="fileInput" multiple="1" accept="*" t-on-change="onChangeFileInput" />
            <button t-if="!env.isSmall" type="button" class="o_button_upload_expense btn btn-primary" t-on-click.prevent="uploadDocument">
                Upload
            </button>
            <button t-if="env.isSmall" type="button" class="o_button_upload_expense btn btn-primary me-1" t-on-click.prevent="uploadDocument">
                Scan
            </button>
        </xpath>

        <xpath expr="//t[@t-component='props.Renderer']" position="attributes">
            <attribute name="uploadDocument.bind">uploadDocument</attribute>
        </xpath>
    </t>
</templates>