Why is it when i try to select a mock location app it says nothing?

If you're trying to select a mock location app and nothing happens, it may be due to several reasons. First, ensure that developer options are enabled on your device, as mock location settings are typically found there. Additionally, check that the app you want to use is set as the mock location app in the developer settings. Lastly, ensure that your device's location settings are properly configured and that you have granted the necessary permissions to the app.