knowledge/document_url/static/src/xml/url.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!-- Copyright 2018 Tecnativa - Ernesto Tejeda
     Copyright 2021 Tecnativa - Víctor Martínez
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
<templates>
    <t t-inherit="mail.AttachmentBox" t-inherit-mode="extension" owl="1">
        <xpath
            expr="//button[hasclass('o_AttachmentBox_buttonAdd')]"
            position="replace"
        >
            <div align="center">
                <button
                    class="o_AttachmentBox_buttonAdd btn btn-link"
                    type="button"
                    t-on-click="_onClickAdd"
                >
                    <i class="fa fa-plus-square" />
                    Add attachments
                </button>
                <button
                    type="button"
                    class="o_add_url_button btn btn-link"
                    t-on-click="_onAddUrl"
                >
                    <i class="fa fa-plus-square" />
                    Add URL
                </button>
            </div>
        </xpath>
    </t>

    <t t-inherit="mail.AttachmentCard" t-inherit-mode="extension" owl="1">
        <xpath
            expr="//div[hasclass('o_AttachmentCard_details')]/t/div"
            position="replace"
        >
            <a t-att-href="attachmentUrl" target="new">
                <t t-esc="attachmentCard.attachment.displayName" />
            </a>
        </xpath>
        <xpath
            expr="//div[hasclass('o_AttachmentCard_details')]/t[2]/div"
            position="replace"
        >
        </xpath>
        <xpath
            expr="//div[hasclass('o_AttachmentCard_asideItemDownload')]"
            position="attributes"
        >
            <attribute
                name="t-if"
            >attachmentCard.attachment.mimetype != 'application/link'</attribute>
        </xpath>
        <xpath expr="//div[hasclass('o_AttachmentCard_image')]" position="attributes">
            <attribute
                name="t-if"
            >attachmentCard.attachment.mimetype != 'application/link'</attribute>
        </xpath>
        <xpath expr="//div[hasclass('o_AttachmentCard_image')]" position="before">
            <a
                class="o_Attachment_url_icon"
                t-att-href="attachmentUrl"
                target="new"
                t-if="attachmentCard.attachment.mimetype=='application/link'"
            >
                <i class="fa fa-link fa-2x" />
            </a>
        </xpath>
    </t>
</templates>