Beginning with android the first question I had is privacy and still don’t have a perfect solution.
But urgency was to hide images from showing up in the gallery.
Solution is create an empty file in the folder you want to exclude from gallery. Name the file .nomedia

Remember a few things:
1. Its excludes media from gallery; not really hides it. A browser can still see it.

2. Name carefully. It shouldn’t have any extension

3. Be on lookout got a better solution.