Uninstall any JoiPlay version from the Google Play Store. That version is crippled for Unity.
Regularly clear the JoiPlay app cache in your Android system settings to free up system memory (RAM). unity plugin for joiplay free
Once both are installed, you're ready to add a game. Uninstall any JoiPlay version from the Google Play Store
Summary of possibilities
With the right settings and a bit of patience, you can transform your Android phone into a portable Unity gaming machine. Whether you want to play atmospheric exploration games, 2D platformers, or narrative-driven VNs, the free Unity plugin for JoiPlay is your ticket to mobile freedom. or narrative-driven VNs
: Bridges the gap between PC-oriented Unity games and mobile screens by providing customizable on-screen controls. Review & Community Feedback