I keep getting the same error when trying to upload a Facebook Gameroom or WebGL build.
Error:
Must Reference SDK via CDN
Games must reference one of our supported SDKs via our CDN.
Is it indeed impossible to upload a Unity build to Facebook at this time, is it a bug that is being worked on?
There are numerous ambiguous references to this issue on the web, all unresolved:
https://stackoverflow.com/questions/49638259/cannot-upload-game-assets-to-facebook-web-hosting