Dimension V3.4.8 not subport .glb model

try rolling back to the build before V3.4.8 and see if that then opens your glb file

p.s, just to be clear, Adobe Dimension is finished so Adobe doesn't "support" anything to do with it, reguardless of build... they have moved on to Stagger and it shows

Please send your file on email that appears in warning windows.