Symptoms

The error message appears in the UI when embedding an image:

Unable to render embedded object: File (<filename of the image>) not found. 

Causes

This can be caused by either of the following:

1. The tagLinks plugin causes this message for underscore and dash characters.
2. A Confluence bug, CONF-13526 causes this when # $ or % characters are in the file name.

Workaround

If using tagLinks, disable or uninstall the plugin. Note that this is not an Atlassian supported plugin.

If your file name uses the mentioned special characters, rename it.

Resolution

Track a resolution at CONF-13526.