There are some limitations of the Test and Run mode currently in FlutterFlow which I will try to write a list about so people don't get confused why something it is not working in Test and Run.
Important! If something is not working in Test or Run mode deploy the project for mobile or web or both (it depends where you want to use your project) and test it.
List of limitations of Test/Run mode so far
You can't run custom code that includes path to Assets folder
You can't run any functionality that requires you to request permissions (like microphone, camera)
You can't run Lottie animations as per issue 308
Launch Map action does not work (pointed by @Ahmed Kameel)
[Test mode] Currently you can't load the default images (updated june 2023)
If you find something that is missing in this list please write about it.