Data is loaded by one of two methods: drag/drop of a specific chart file, or via a chart library.
Any shp or tif file can be dragged into Debrief - provided the prj sidecar files are present. When saving the plot Debrief will record the path to the datafile in the .dpf file in order that it can be reloaded at the next session.
Separately, Debrief can provide a folio of charts
Figure 10.2. Chart options
As you saw, there is also a transparency
Once a parent folder is specified, when you click on Insert Chart Library from the Chart Features menu Debrief will scan the child folders for correctly named shapefiles and offer you a list of folios to choose from. Select one to load the folio.
Figure 10.3. Chart folio
If you right-click on the chart library in the Outline View you'll see the editable properties. These include the colour used for the rectangles plus whether the chart name is displayed against the chart rectangle.
The folio displays a rectangle for each available chart. The folio is a top-level layer in the Outline View that you can expand to view (and load) the child charts. Alternatively, right-click on a corner of one of the rectangles and select 'Load this chart' to load a specific chart.
Figure 10.4. Loading a chart
The chart will then be loaded as a separate Debrief layer - and appear in the layer manager. As with any other layer, you can control it's visibility using the Outline View. Note, Debrief isn't going to store the chart image in the plot-file, it's just going to store the path to the Image - which will re-loaded next time you open the plot.