SYMPTOM
When utilizing a full or absolute path to specify an image in a PDF export, the image PDF document is replaced with a "red x" as shown below:

Note: When running this document in both Web and Desktop the image is correctly rendered.
CAUSE
There are empty spaces in the full or absolute path to specify the image's location. The empty spaces can cause the export process to
fail when locating the image to export.
ACTION
Remove the spaces from the path, or substitute them with '%20' which is the HTML encoding of the space character.
KB8971