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I am trying to add functionality to a theme I am building by adding a function in WordPress post editor that would allow user to upload/enter URL of image that I would latter use as replacement for video slider in home page, on small screens.
Where do I start to look for information on how to do this?
From what I got until now, I need to provide part in editor that saves URL and adds that data to post. Then with wp_query that slider is calling I would get that image for currently selected post and replace/hide with JS/CSS video in slider and place instead of him a image in his container.
And advice on how to accomplish this would be greatly appreciated. Thank you.