Hello Bill,
I'm happy to chime in. I understand your colleague would like to open a Storyline 360 project in Storyline 3. However, there may be times when a new feature in Storyline 360 isn't compatible with Storyline 3. In that case, don't use the new feature in Storyline 360 if you need to transfer the project file to a Storyline 3 user.
Storyline 3 projects always open in Storyline 360. You can also open Storyline 360 projects with Storyline 3 unless the Storyline 360 project has the following features.
Please don't hesitate to reach out if you have additional questions.
