Test Orchestrator must be enabled, so that screenshot generation can walk through the app like a newly registered user. The screenshots are stored outside of the app's storage directory, so that Test Orchestrator does not delete them. Because hard-coded paths are used, it is possible this could be brittle with future versions of Android
A future enhancement would be to also copy these screenshots off of tests run on Firebase Test Lab. This would likely involve configuring Fladle/Flank with additional directories to pull.
Carter Jernigan