ToDo needs work!
Needs UI element "resource browser"
point resource browser to a folder of choice (Pixera/Resources and so on)
point playlist editor to an empty layer on a timeline (I prefer an empty timline with one empty layer)
save and exit edit mode.
Now drag and drop a content from the resource browser to the playlist editor.
Important: Open UI an a Browser for all further interactions as drag and drop is not supported in the Pixera UI