We are facing the below issue. We are using svg and png images in our website. png images are working fine and some .svg images are not showing up in the preview or not working when we drag and drop in the file upload field. However, few svg images are working fine and showing up in the preview.
Can you possibly check, if the issue reported on  is linked to yours? It seems to have been resolved by WCM core components (2.1.0).