I have header images I want to use. I upload them and crop them successfully. But then wordpress won’t let me choose a custom header for each page. It says my changes have been published…but they have not.
From Appearance → Header you can also upload your own header image, change header text color, or remove header text completely. You can also upload custom images for individual posts and pages using Featured Images.
A featured image that is at least 990 x 180 pixels will be used as the header image for that post/page (if the featured image is smaller than these dimensions, then the theme will display the custom header image, if one has been added).