This is most likely due to a space or some other non-alphanumeric character that is present in your file name.
If there is a space in your filename that is causing a broken link, just do the following:
- Rename your original file so no spaces exist in the name. Use dashes or underscores to separate words, or just run all of the words together. It is also recommended to keep all text lower case as this helps to better auto sort items in the file browser.
- Upload the newly named file into your site and embed or link it (make sure you delete the old file).
- Preview the node and then Save. The image should now appear.
If the problem persists, submit a Help Ticket to CWS.