Subject/sky future not available for Android phone

This is lifted from a post on another thread by Rikk, who works for Adobe:

Certain features like Select Subject and Select Sky in Masking are supported only on Android devices with more than 6 GB RAM. Technology Previews (features that may not be completely production-ready yet but available to try out) are allowed on devices having between 4 GB and 6 GB RAM, but you could experience an occasional crash under memory pressure. On devices with less than 4 GB RAM, these features are unavailable.