Accepted: STL, 3MF, OBJ, STEP/STP, IGES/IGS, PLY, AMF, GLB/GLTF, FBX, DAE, 3DS and ZIP. Maximum upload: 18 MB. Layer attaches compatible files when possible and also includes a private backup download link so your model is not lost if an email provider blocks the attachment. Larger files should use the full Quote page.