Files "on my phone", but not in iCloud
I have some items in the Files app on my iPhone that I want to be able to open on my PC. but whenever I go to iCloud.com, none of them are there.
I checked my iCloud settings, and iCloud drive is set to sync, including "documents and data". I've force synced it, toggled it off and on, and waited a full day. Still nothing.
Is the "Files" app on my iPhone kept separate from iCloud? how can I sync it?
Windows, Windows 10