After we opened a new "Data Project" from Brasero we see the following empty window:
We can now easily drag and drop files, directories, or multiple selections to this space.
Alternatively there also is a right click option on selected files "Send to..." where we are able to send these to the "CD/DVD Creator".
In case we need to work with full screen application we may use Nautilus option "View -> Extra Pane" to open the location
burn:///. We can open this location, drag and drop files from the second pane and choose to write to the disc from Nautilus in case we inserted a blank disc.
In case we had the Brasero icon attached to the Launcher (choose "Lock to Launcher" on the right click menu that pops up when you click on the icon of a running application) we can also drag and drop files to this icon on the Launcher. This will then open Brasero with the files we had dragged in the project window.