A. 1. Make sure you are following the correct steps to create and apply custom effects. Open the app, go to the effects section, and select 'Create Custom Effect'. 2. If you are experiencing issues, try restarting the app and your Twinkly device. 3. Ensure that your Twinkly device is connected to the app and that you have selected the correct device if you have multiple.

B. 4. If the custom effect still does not apply, try creating a simpler effect first to see if the app can handle it. Sometimes complex effects may cause issues.