Many users fail at this step because they assume JoiPlay is a one-click installer. It is not. You must install three (sometimes four) components in the correct order.
Technical design considerations for developers
Only players.
The character sighed—a sound that wasn't in any voice bank. "The plugin is emulating a Transform component that doesn't exist in mobile IL2CPP. Every frame, I lose a variable. First my position. Then my rotation. Eventually… my script."
There is a massive library of indie Unity games available on platforms like itch.io or Steam (RPGs, visual novels, puzzle games) that never received an official Android port. Joiplay allows players to access this library without needing a laptop or a Steam Deck. joiplay unity plugin
If you are having trouble getting a specific game to run, let me know the title, and I can give you more targeted advice.
Go into the game settings within JoiPlay and adjust settings like resolution scaling or frame skipping. Many users fail at this step because they
Swipe down from the top of the screen or tap the small chevron arrow to open the JoiPlay overlay menu. Tap the icon to edit layout controls.