Smothing on marmoset

hello, i cr8 the gas bottle in 3ds max, like the lowpoly model, unfortunately i cannot smoothing on with the turbosmooth or mesh smooth, after the importing into to marmoset, textures and all other looks, good, but as u can see on my picture, the hard edges is still visible, there is some way how to smooth inside of MT or is i must prepare something before exporting FBX, i will glad for any advice.

Thank u