Our site uses AssetBank to serve up images for our website. Can I take advantage of Polish and WebP?
If AssetBank is a CDN, the answer is no.
Cloudflare will only apply Polish for images it caches. And Cloudflare will only cache images on your domains that are proxied by Cloudflare, not images on CDNs.
AssetBank is an asset management solution it is not a CDN. I found this that refers to using Google Cloud for images.
What I am wondering if we can take advantage of Polish and WebP if we are using an external Digital Asset Manager like AssetBank?
No, if the images don’t pass through Cloudflare they won’t be polished. You could use a Worker to fetch them if a CNAME doesn’t work.