With Android 6.0 Marshmallow, you can also turn your microSD card into internal storage. With addition of my 64GB microSD card, I was able to turn my 16GB internal into 70GB internal storage!
If you want to experience Android 6.0.1 Marshmallow on your Galaxy S3, CM13 ROM is definitely the way to go so definitely check it out for this week’s ROM of the week.
Installation is straight forward, just like all the other ROMs. Just make a backup ROM and flash away!