Hi everyone, I found this answer today (in the link below). It’s a bit of a hassle, but it’s at least some sort of a solution for deleting files from the CDN. Hope this helps:
Backstory: After reading through this link above, I emailed Webflow support to have a few .mp4 files removed that I was testing out at one point on my site. Although I deleted them from my assets weeks ago, they were still registering/loading and they showed up in my PageSpeed Insights report as third-party code blocking the main thread (because it’s forcing the server to pull from Webflow’s CDN each time). And that impacts your page load time. I will update the thread with the results once I hear back from Webflow support. Hope this helps!