You don't have to be signed in to both computers at the same time to sync your galleries. After signing in once with your ,  will recognize your  when you sign in from another computer.
Za sinhronizacijo galerij vam ni treba biti vpisan v oba računalnika hkrati. Ko se enkrat vpišete z računom , bo  prepoznala , tudi ko se vpišete iz drugega računalnika.