Hello,
I simply want to add a "send email" button with Nuxeo Studio, just like here :

I added an XML extension with :
<extension target="org.nuxeo.ecm.platform.actions.ActionService" point="actions">
<action icon="/icons/mail.png" id="sendEmail" label="action.email.document" link="send_email" order="17" enabled="true" >
<category>DOCUMENT_UPPER_ACTION</category>
</action>
</extension>
==> the button appears, but no email is sent 😞
Do you have any idea why ?
Thank you