The problem with the missing images can also be found on my websites.

If the images can still be found in Website X5 and in the preview of WebSite X5, then click on "Preview" at the top while holding down the left Ctrl key and wait until the lower scroll bar has completely scrolled through. This will restructure the pages.

Then export the entire website to the Internet, not just the updated files.

Request the files again from the web server in the browser using the key combination Ctrl + F5, then the images should be visible again.

Sometimes the images in WebSite X5 are missing in the image objects or as a background image in the line style; reinserting the images helps here.

Some other users also have the image problem.

Thanks. 

After exporting the complete website, images appear which were not appearing previously. But some other image gets disappeared. What to do please. 

What if the now missing images are added again in the corresponding objects in WebSite X5?