Vyond videos are blurry once uploaded into SL360

Actually the answer is not always going with the highest resolution as depending on your course content the size of your project will also increase.  For example, if your content is published to an LMS and is played in a window then 1920x1080 is wasted. Don't forget the player also takes up room. So I prefer 1024 x 576 and when you create your Vyond videos also create them for the same resolution. Assuming when you add the video to a slide it's the same size as your slide. There is also a compression setting you can adjust on your videos.