If you need to add images to your .md file, do it as follows:
If the .md and image files are in the same folder, specify in the link only the file name (without a path).
An example of a reference to an image: <img src="img/diagram.svg" alt="" style="display: inline-block; height: 1.25rem; width: auto; vertical-align: text-bottom; margin: 0 0.25rem;" />