i am getting this error "Could not load the preview image. Please reload the page and try again" whenever i upload any image on my Blog Site blog.knorish. I can see the thumbnail and image is loaded in Image folder and database with multiple sizes but on viewing it shows error, Divi Extra theme is being used to create this blog site. I am sending you the screen shot of the error page.
In my particular case functions.php of my theme was involved.
Just remove empty space after end of
"<?php /*code or comment*/ ?> "
There should be NO empty space between
"<?php ?>" tags.
You can find more info: https://wordpress.org/support/topic/basic-image-editor-not-working/