No sorry, I meant my original glb file is over 1gb. Re-exported and it’s the same. There are 9 meshes in the file, fairly small meshes but each with 15-30 morph targets.
Re-exported from blender and still the same on import in UE. Not sure what else to do, works fine as a single fbx, is there no way to just have UE keep them separate on import via an FBX import?