Hi There!
My name is Cassandra. I am on the Microsoft Dynamics 365 Product Visualize team. Happy to help!
A few questions: What is the filesize of the GLB?
What is the device you are using (iPhone 6s, iPad Pro, etc)?
It sounds like it is the case, but just to confirm, does the GLB work in other Microsoft apps (for example, Layout)
Was the GLB converted using the Layout Import Tool?
If we don't find an obvious solution, we could also provide you a sample GLB that you can try using the same process so that we can rule out your upload process.
We appreciate your interest and feedback through our preview, and we look forward to helping solve this.
Best,
Cassandra