Screen record once and use the same recording in three ways

Once you have inserted your screen recording in one format, you can select the lower portion of the Screen Recording button to see a drop down of the recordings available in that project. From there you can select one of your videos again to insert in a different format.

This article may help as well - https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-insert-screen-recordings