What are the image uploads on the bottom of the article editor and Page editor

The 15 images at the bottom of the page are used for Page slide shows if you site has one incorporated in it's header design.  This allows each page to have it owns set of images.  

The 5 images at the bottom of an article are used by several templates. #1  #2 #10 #20. 
Template numbers 1 & 2 utilize the first image.  Template numbers 10 and 20 can utilize all fime images.  

These images are uploaded from your computer only.  If you wish to change an image you can simply upload it over the current without first deleting the original.