Hi Sakis,
1) First I set up my environment with gunicorn as the application server and nginx serving up /static/* and /media/*
2) When an image is dragged into froala a http request is made to a django view which uploads the image and returns the path of the image in the form {link:'path/to/file.png''} by viewing the console (ctrl+shift+j in chrome)while dragging images into froala I saw that the wrong path was being returned (a leading / was missing) I edited froala's view.py to return the correct path. While I was there I also edited it to save file uploads to the correct location.