I am having issues with saving a product when a picture is added into the WYSIWYG editor or product description at all. It allows the image to show up in the WYSIWYG, then when I click save, it kicks me back to the dashboard and no changes are saved. I figured I out when a product that previously had an image in the description would not allow me to make any changes. Once I deleted the image in the description, I was allowed to save the changes made. Now on new products, it still won't save if I try to add a picture to the description.
In editor there is option for insert image using that you can upload image and the tag will add in editor. also please check the permission for the folder where you add the images.