The tab for background images only applies to static background images.
When you click on the LOAD button, you are presented with your operating system's locate file dialogue. Selecting the image locally and clicking OK returns you to the tab and a view of the image.
Note
Static background images are embedded in XML that is stored in the column report_source in the table report. As such, when you save a report definition locally in XML format, the static image is embedded in it and transported with it.
