Sometimes when viewing a lesson in the Preview tab of CMS, you might notice your image doesn’t display or looks “broken.” When you're uploading an image to CMS, you must make sure the image name does not contain spaces or punctuation.
For example, if your image file is titled "Henry Ford’s House.jpg" you'll need to change it to "henryfordshouse.jpg" before uploading. This should fix the error and the image should display correctly in the Preview tab.