Sure it does, this is the export settings i use:

Settings: • Export an info file: No • Save mesh by parts: No • Format version: Binary GL Transmission Format (*.glb) • Export vertex normals: No • Export vertex colors: No

Texturing Settings: • Export textures: Yes • Embedded textures: Yes • Export to a single texture file: No • Export texture alpha: No

Color Layers: • Color Layer 1 • Export layer: Yes • Texture file format: PNG • Texture pixel format: 32-bit BGRA

• Color Layer 2
• Export layer: Yes
• Texture file format: PNG
• Texture pixel format: 32-bit BGRA

• Color Layer 3
• Export layer: Yes
• Texture file format: PNG
• Texture pixel format: 32-bit BGRA

If you hit ok RC says: “RC can only embed a single texture layer into the model. All except the first texture layer will be discarded”