Here we have the changed customized links for Timeline like i/una-13-1. PM me plz with your UNA studio access.

This issue applies to everyone; even una.io.

Click on the + (Add Content icon - top right)

And choose 'Update'.

So what is the link we need to add in 'studio/builder_menu.php?page=items&module=system&set=sys_add_content_links' >> Edit "Update" Item, to make it work?