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If the photos are from your desk top you should just be able to drag and drop into the text box. I think that they have to be jpg or gif so you may have to convert the files before they take. Give it a try!

*.PNG can aslo be drag and drop, I'm loving how easy it is, also there is the https://guides.github.com/features/mastering-markdown/
awsome page.
The first image, the full glitch, it's from...