Open the model on 0xr.space, press More in the dock, then Explode, and choose X, Y or Z. The parts move apart along that axis so each one can be seen on its own; Off puts them back. Click, tap or pinch a part to select it. With hand tracking on a headset you can also draw a loop round a part to select it, and a double pinch on the model turns explore mode on or off, in which each part can be pinched on its own.
Explode only appears when the model has at least two parts, so a single-mesh STL or a scan has nothing to pull apart. The parts are the file's own: a STEP keeps its bodies, while an IFC building is merged by colour and comes apart in colour groups, not walls and doors. Animation stops while the model is exploded, and Explode is greyed out while you place the model.
The model has only one part. Explode is hidden for a single mesh, which is how most STL files and scans arrive.
No. Element and storey data are not kept, and the geometry is grouped by colour, so it separates into colour groups.
In VR, yes: a double pinch on the model turns on explore mode, and each part can then be pinched by itself.
No. It is read on the device, and nothing is sent to a server unless you create a share link yourself.