Can I use the new Savvas Admin UI to add assignments to my LMS courses?

You cannot use the Savvas Admin to assign Savvas content, such as the Momentum Screener and Diagnostic Assessments, to your LMS courses. 

What are my options for assigning Savvas content from Savvas Admin?

There are two options to assign Savvas content to students:

Why can't I assign to LMS-created Classes with "(LMS)" suffix?