First time noticing this, but Editors can’t add SVGs to image fields within collections. They can only add PNG, JPG and GIF files.
However, designers can add SVGs to the same image fields
I’m not sure why this limitation is in place for editors, but it’s not great for cards/components with interchangeable icons.
Created a wishlist item to remove the editor limitation (or oversight):
https://wishlist.webflow.com/ideas/WEBFLOW-I-6770