My sincere apologies for the delay. We were streamlining our Resources section to make it a go-to for all critical queries. Not sure if this is already addressed elsewhere, but let me still post a response to it here.
As of now, you can only use the quizzes you create in Testnia on MemberFactory and CoachRack.
You can suggest a new feature in Testnia, that allows you to use Testnia quizzes outside the scope of the Invanto apps in https://community.invanto.com/ideas/.
Please note that we value your feedback and suggestions.
If you have any questions or concerns, please let me know.