Due to browser security settings, the editor cannot access your clipboard data directly. To paste an image/ text into the text box, please use the 3 option highlighted below in the formatting toolbar.
From left to right;
the first option is to paste anything you have copied from any source,
The second option is to paste Text only from any source
The third option is to paste Text/ image from Microsoft Word which should keep the same format from the source
Tips: copying images into a blank word doc first to resize the image before using the options above to paste it into the group mail is very helpful with larger images.