This app is a free tool that can be used to check whether your device is compatible with USB OTG or not. The best thing is that this tool is simple to use and doesn't require root. You don't need to do anything other than plug in and out an USB cable.

The first step is to make sure that the device you want to check supports USB OTG. If it does, then the next step is to make sure that it is compatible with the device you want to use. The last step is to make sure that the device is properly connected to the USB source.