OneDriveだとタグ打てるらしいけどGoogle様は対応する気がないのかな
https://lh3.googleusercontent.com/-BNXmPcLT_jI/WF6idllF4EI/AAAAAAAFoVc/FKp49QFoUxwgiNRZuRL6lkrQEs6KE3pOQCL4C/s1600/Onedrive.jpg
https://lh3.googleusercontent.com/-HTLSrqtp5Fo/V_NUxiLg3nI/AAAAAAAFoVc/TKoikU58ELsaP2I5MxV3Df74OTWNZ3LiwCL4C/s1600/OneDrive-nieuw.jpg

https://productforums.google.com/forum/#!msg/photos/wgWGQH3CeTU/0ycTLU5pAgAJ