Photo Stream is (was) a temporary storage of the most current 1,000 photos you've taken that, for 1 month, are available to all of your devices on the same Apple ID. The better way to make ALL of your photos available to all your devices is with iCloud Photos, which keeps them all in your iCloud storage with no limits (other than the capacity of your iCloud storage) and for as long as you want them kept. It's the FREE Photo Stream that is going away; iCloud Photos is now the way to do it. [For help and more information about iCloud, stay tuned for my future iCloud Flash Class.]