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Kenn Hyatt9,683 Points
Where is the course that explains how to implement the upload function when developing wordpress themes?
You know, that window in some themes that pops up and and shows the media gallery to select or upload a picture or a list of pages to select for a link.
Honestly, it really boils down to what you are trying to do with it. How you add a featured image is not the same as using say the customizer to add media.
So without more details in to specifically what you are trying to do. There is a limit to how much information can be provided to you.