ARKit image detection

Hi, I try to use the new image detection feature in 4.20 preview 4.
I’ve created an ARsession and a ARCandidateImage asset with a texture as image to detect. But I am not able to go further because the ARCandidateImage is not listed in the ARsession settings, I am not able to chosse it as the target.
Is there someting specific to do to get the the ARCandidateImage asset listed ?
Is it broken or I do in wrong ?

It is enabled in Preview 5 if that is any help

I am using UE 4.20.1 and I have the same issue where I am unable to select the ARCandidateImage asset under the ARSession settings. Does anyone else know of a fix?

Yes it works. Did you load the ARKit plugin ? Then right click in the browser and in the popup menu : Miscellaneous → Data Asset → ARCandidateImage.

My bad. I was trying to add a candidate image to a candidate object field instead.
It works for me now.