1. You must be on Rich Text not on HTML!!
2. Click on Insert/Edit Image
3. Find our picture on Google from you Iphone
4. Click on Image and this should show up
images may be subject to copyright
5. Click Share Image and this should show up
6. Click Copy
7. Go back to Ao3 and click on Image/Edit Insert
8. Click on first box to paste then the rest auto fill. (You can fill in the Image description part if you want, I never do. Lol)
9. Click "ok" and your Image should appear in blue
10. Click NEXT to it, not ON it. If you click on it, it will delete and you will have to start over.
11. Enjoy your new picture or gif!!!