Thunkable app : black arrow key doesn't work after scanning or manually typing code

There must be a bug in the app. Tried scanning and manually typing in code. So where can I go from here. Bout ready to toss this and go back to MIT.

Well no one has replied, but it turns out I don’t need to anyway, as I’m not likely to make an app that would be fit for GP anyway, so I’ll just download the apk and install it on my own phone. Thank goodness for Samsung! Can you imagine the hassle it would be trying to load it on an iPhone!