Hi, tl;dr: How can I view my own private .glb files in a 3D environment, ideally even passthrough?

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It's frustrating how difficult it is to find an easy answer to this. Essentially I have some 3D models I've captured myself using Polycam that export as .glb files, and I want to view these in VR, much like VRGirlz Lucid Dreams. From what I've seen, Figmin XR seems like a pretty good app for this, except to import models you have to upload to sketchfab, and I obviously don't want my private nude models up there.

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Is there not a simple viewer which would let me view .glb files that I manually transfer to the headset without an intermediary of uploading private files to a public server?