In this video, you will learn how to import models into your Twinmotion projects. There are two types of imports: geometry and landscapes. There are numerous types of import file types that are accepted by Twinmotion. This video covers an example of a landscape import as well as The three types of import options for geometry.
https://dev.epicgames.com/community/learning/tutorials/EDLj/how-to-import-models-landscapes-twinmotion-2020