In ShapesXR, export the frame from the Export tab of the Collaboration menu, or an object from its three-dot menu. The file lands in the Exported folder of My Files at shapes.app/files. Open that page in the Quest browser and download it, then open 0xr.space, press Open and choose the file. glTF and USDZ both open, on the page or in the room, with no Model Explorer account and no upload.
Model Explorer shows the geometry and materials in the file. It does not play ShapesXR frames, transitions or interactions, and it cannot open a ShapesXR space itself. A glTF that comes as a .gltf with a separate .bin and textures must be chosen together, or as one ZIP. Downloading from My Files needs your ShapesXR sign-in.
Either opens. USDZ is read by a USD reader written for this app; a USDZ it cannot read says so rather than showing an empty scene.
Not for Model Explorer: opening a file needs no sign-in. Downloading the export from My Files needs your ShapesXR account.
The .gltf names images that were not chosen with it. Choose the .gltf, its .bin and its images together, or a ZIP holding all of them.
Not by Model Explorer. The file is read on the headset, and nothing is sent to a server unless you create a share link yourself.