Assets from Microsoft's 3D Library and Paint 3D are not showing up

I am a teen librarian trying to create some A.R. scenes for an upcoming program. I've used this program before successfully but this is my first time using 3D assets from outside the preloaded ones. I found a library of assets preinstalled on my work PC and found out I can edit them (or create my own) in Microsoft's Paint 3D program (also preinstalled). I export everything as a .GLB and it imports seamlessly into Aero. I can even edit everything and it even appears in the preview image while it is loading on my phone but once the scene appears, all of those assets are missing and a red box blinks with error codes but they are mostly written in code. Can anyone help explain why that is and what I can do to fix it. I do not have access to other Adobe software as we are on a public library budget. Thank you!