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I place the photo in my section background but the bottom point is not showing.I also used the instruction that Jean give, that still did not work. I am missing something not sure what.
As I can see you want to display the tooltip in the section below. Your image should be just uploaded to your media library, not as section background.
Also your image must be only the tooltip like this:
And you need to add the custom class home-info-section to your 4th section. Hope that now is more clearly the steps.