It is possible to paste image data from the OS clipboard.
Those images are stored as data-urls.
Data-urls may be very long. Therefore we should not show this url in the image properties panel. Instead we now just show a hint that the images is "embedded".
Note:
Embedded images in general are not recommended. If needed the images should be small. Embedded images can't be scaled and are duplicated in archived contents blowing up the database.