HI Alex, sorry for the delay of my response. I'm back to this subject.
There is something strange on transport options node. Read node is called to to get my pictures list, here is the result :
[{"pic":"553f3edf369cd7ec01f1fb4b","description":""},{"pic":"553f3edf369cd7dc01f1fb4c","description":""},{"pic":"553f3ee0369cd7dc01f1fb4d","description":""},{"pic":"553f3ee0369cd7dc01f1fb4e","description":""},{"pic":"553f3ee0369cd7dc01f1fb4f","description":""}]
But thumbnailUrl nor imageUrl are called when I open image selector window nor click on picture (see the capture).
Maybe the json fragment received on read is not correct ?