I was stuck at the exact same problem. Had some help from the AR UE Discord and created a short Youtube tutorial. You can try to solve it like this → https://www.youtube.com/watch?v=4Py8nD0a8I0
Hope that helps 
I was stuck at the exact same problem. Had some help from the AR UE Discord and created a short Youtube tutorial. You can try to solve it like this → https://www.youtube.com/watch?v=4Py8nD0a8I0
Hope that helps