Updated category images (thumbnail and main) are not quickly displaying on the backend or frontend of our Magento 2.3.1 installation after the original file has been deleted and the new image file uploaded without error.
I purged all cache on Cloudflare and the issue still persisted. Later, I performed a custom purge of the page and image URLs to no effect.
Filezilla indicated that the new files have been successfully uploaded to our Nexcess server and that the old files are no longer there.
It was only hours later that the new images correctly populated the backend and frontend, which is obviously not great since we want changes to be visible right away.