When exporting a GLTF 3D model, textures go missing mainly due to improper texture referencing, embedding, or incompatible export settings.
GLTF uses either linked textures (kept with the .gltf file) or embedded textures (in .glb files). If paths break (e.g., moving files) or embedding is skipped, textures vanish. Non-standard formats (like unsupported compression) also cause this.
To fix it, embed textures for .glb, keep textures in the same folder as .gltf, use standard formats (PNG/JPEG), and avoid renaming or moving files after export.