I think it doesn't change anything... May be I miss something...
To be clear, I select the first sequence's picture of each camera, next I align photos. After that, I export my camera in Xml.
I create a new scene, import all sequence picture of each camera,( "1 multiframe chunk, 23 camera" in my case), then I import my camera in the current chunk (can't import camera in an empty chunk). The aligment begin automatically but PS don't create anything... So any idea?