You should have Gallery in the app drawer. You can also get to it from the camera app.
And the stock gallery sucks. If you have lots of directories and sub directories with lots of pictures, the stock gallery just throws everything into one tree, which is horrible. Fortunately, there is a solution:
https://forums.androidcentral.com/e...?id=com.alensw.PicFolder&hl=en&token=jKnKnJnJ
It is the ONLY really gallery option that also allows browsing by directories and subdirectories. Love it; highly recommend.