Overview
Kepler - Attachment fields | simple & multiple is compatible with plugin Refined for Jira | Sites & Themes with used for Jira Service Desk portal.
How to use
To make it work you will need to include this script to refined for Jira :
<script src="/download/resources/com.keplertechnologies.attachFileCustomField:jsd-refined-resource/afc-refined-adapt-script.js"></script>
In REFINED Page Config, Administration > Refined Administration > Themes & Styles. Turn on "Activate custom HTML" and add the above script in the section "At end of body".
