This report summarizes the results of the measurement of production cross sections and coupling properties of the Higgs boson in decays to two photons. The measurement is performed using $79.8 fb^{-1}$ of data from LHC proton-proton collisions at the center-of-mass energy of $\sqrt{s}$ $= 13$ TeV recorded by the ATLAS experiment. These results have improved precision compared to the results previously reported by ATLAS which used $36 fb^{-1}$ of data. Differential cross section measurements targeting gluon-gluon fusion production in association with b-jets have also been added.