Have you tried the Google Photos app? The app might already be installed on your S6, but you can get it from the Google Play Store (it might be a good idea to go to the Play Store to make sure it is updated). The app can automatically back up any picture you have and it can then be accessible by going to https://photos.google.com/. From there, you can download the picture locally, share it with friends and loved ones, or make online albums.
The service is free and Google offers unlimited storage.... and you don't have to fuss with cables or connecting your phone to your computer.