Can you add more storage to my iPhone 6s

You cannot add additional storage on your iPhone. If you need more storage space, you have two options:

1. Remove little used apps and data.
2. Get another iPhone with a larger storage capacity.

Hi, you can buy I cloud storage up to 500 gb and transfer all your pictures and documents there. This way your phone memory will not be used. optimise photos storage, it will store all your photos on I cloud and remove them from your phone. you can always copy them back to your phone. Hope this helps