The current resolution is to create a separate extension to embed Order Ship Express within the Sales Order Shipment. We have an example extension available here. Your partner may want to roll this into one of their extensions, or change some of the properties within the app.json or object naming.
<p data-select-link-text=”1″>If you don’t want to engage your partner, we do temporarily have a build of the extension available here. Though I would always advise to validate the contents of the app before installing.</p>