Cloudflare Apps not showing on Google Sites domain

Hi! I’m using Google Sites for my app and one of my priorities is to get Cloudflare Apps to show on the domain. However, I tried for a while now and I cannot seem to get Cloudflare Apps to work on the Google Sites domain. However, I did some investigation, and when I used a proxy, the Cloudflare apps seem to shown? How do I make the apps show on the domain without the need of a proxy to actually see it? Thanks!