Common causes
| Cause | Fix |
|---|---|
| The file was deleted from the media library | Upload it again and update the link |
| The link was copied from another site | Upload the image to this site's library |
| The URL has a typo | Copy the link again from Media |
Check the link
Open the image URL in a new tab. If it opens, the problem is in the Markdown (for example a missing ! before [alt text]). If it does not, re-upload the file.