Hey there oXY. 2nd Mip for a 2048x4096 would be 1024x2048, then 512x1024, etc. However, depending on the converter, if you feed it a non powers-of-two image, then it may pad the size upwards. If the converter was dumb, 2049 would be padded out to next larger pow2... which would be 4096. If converter doesn't change mesh UVs…