I am working on AEM 6.4 we have created few cloud configs(like facebook and twitter connect) and expecting that should be visible in page properties cloud config dropdown but they are not visible there is already 1 thread for same discussion
As mentioned by Sunjot, the configurations are now stored under the node /conf/<my-app>/settings/cloudconfigs/<cloud_service>.
Go to Sites, select your application root, and click properties. Note that a cloud configuration value is found under the advanced tab. Clicking on the cloud configuration field brings up a conf browser. Select the configuration folder that was created earlier on (my-app).
Cloud Service tab is still used for legacy cloud services (i.e. cloud services that have not moved to /conf and whose configs continue to reside in /etc/cloudconfigs).