Png images load and show in asset list but don't render on parcel

Any thoughts on why they won’t render. They show up in the asset list. Standard .png file and the url starts http//: etc. I hit upload, shows it uploading and then nothing appears. Any help would be awesome. Thanks. Never had this issue before. Tried many different files. jpeg, pngs, even tried to re upload one that I had just deleted that was showing.