Over all my years of participating in forums supporting RoboHelp, one of the frequently observed things was confusion over what needs to happen to make something like Storyline files play.
I find it's most helpful to work using the following approach.
At the end of the day when all is said and done, what you need to consider is that something like Storyline output is in and of itself a kind of ecosystem. There are likely many files and possibly a folder structure that make up the Storyline output.
Your goal, of course, is to add those to RoboHelp in a way that they are left intact. Then however you are making the link available to your end viewer, make that link point to the single file that opens and launches the Storyline (or whatever output) content.
In older versions of RoboHelp, we did this using Baggage. But the new beast is likely different. And I'm sure Peter or others will tell you how to accomplish that in the new version.
If your Storyline output has a folder structure, you will need to ensure the same identical folder structure exists in your RoboHelp project along with all the assorted files that are inside each of the folders.
Hopefully nobody here feels as if I'm talking down to them at all. I just felt this was a subject that could stand some clarification.
Cheers... Rick 🙂