I am not sure whether this is a design issue, but for now I will place it in this category.
Upload an image in the rich text editor:
- If you click on it (which selects it) and then drag it, the image will be moved.
- If you drag it without first clicking on it, it will be treated as a new image resource and the upload operation will be performed again…
I am confused by the latter scenario, because I think that regardless of whether you click on it or not, dragging should move the image’s position rather than re-uploading it. 
If this is not a bug but an intentional design, anyone is welcome to tell me in what scenario repeated uploading would be used. 