I’m having trouble with my hero image not showing in my header when I click save and preview. I have reduced the file size and it successfully loads into the pages media and the image is selected as the hero image, but it is still blank upon preview.
Try to clear the browser cache and cache of the Grav in the admin panel. Try another test image in png format for example. Open the site in your browser in developer mode, find the block with the image through, you need the path to the image. The image must be displayed through a browser or you will find an error in the link.