I don't see in my custom theme any option for uploading the header image (although there is a code for it in the header)
Do I need to register it somehow?
Also, I have a specific size I want to implement, is it possible to hard-crop the header image on upload? (I want it to be cropped, not resized with CSS)
Solution I found:
$custom_header_support = array( 'width' => 260, 'height' => 300, 'header-text' => false, ); add_theme_support( 'custom-header', $custom_header_support );