The Roland EX-50 is built by Medeli, and the DNA is also Medeli, not Roland.
Here is a good video presented by Jeremy See about the Roland EX-50:
https://youtu.be/YU-i7qO9jxs?feature=sharedI don't think the Roland EX-50 would play an .STL file.
The Medeli AKX-10 has an .STY file extension just like Yamaha, but even though Medeli and Yamaha share the same .STY file extension, a Yamaha style won't work right away on a Medeli without some tweaking first.
The following video describes this in detail very well.
https://youtu.be/hIvyhEC1rq4?feature=shared
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