Files/Image files in Moodle are generally not visible from outside if you are not logged in. So an image in an email would be referring to the url of the image and if the student was not logged in the image would appear as broken.
Thank you Marcus Green.
Even if the students logged in they will receive a broken image. By the way this is happen even for the lecturer.
Even if the students logged in they will receive a broken image. By the way this is happen even for the lecturer.
Can you use your browser inspector to find the URL of the image when you can see the image and when it is broken?