How do I add in a scene between other scenes in Storyline?

What you see on the left side is merely SL's attempt to create a graphic representation of the relationship between the slides. It has nothing to do with how your learners will perceive anything.

However, if you are absolutely determined to change the position (The triggers are the only thing that can change the order) of scenes, it can be done.

1. SAVE A COPY OF YOUR PROJECT. This is a very vulnerable activity that can easily end in disaster.

2. Go to Slide View.

3. Always be sure to select a scene by clicking on its title. Select the scene you want to move, then right-click its title. Choose Copy.

4. Select the new position. The copied scene will be placed to the right of the selected scene. Right-click and choose Paste.

5. Delete the original. Select the scene in the old position, right-click, and choose delete.

See the attached video.