The page "Header Image" field populates the header background image.  If a header video is present this image will be the preview image while the video is loading and also serves as the fallback for devices that do not support video.

If the Header Text wysiwyg field is used it will display as an overlay and replaces the header title and optional page description heading.

If the "Hide Page Title" is checked the page title/description will not display on the page.

Page Header Image: 3,840px wide by 1,440px tall.  If you use the "Header Text" option images should be  3,840px wide by 1,440px tall.   For templates that have a custom bottom section for the header area (index and visit templates) the images should be 3,840px wide by 2,160px tall.

Fallback Header Image: The Link List "Default Header" should contain a single link with an image.  This image will serve as a fallback image if no image, video, rotator, etc. is assigned to the page.

Using the field "Header Background Video (mp4/h264)" will replace the background image with a background video.  The video must be MP4/H264 formatted video and should have a ratio of 16:9.

*NOTE - This is a looping/muted background video so the video should be kept short in size/length (under 30 seconds).

If a rotator is assigned to a page the images will display as slides.  The title and caption or optional and will display as an overlay.   The button uses the Button Text field.