Problem solved.
I decided to redownload the files with the save option and UE started joining the bodies.
Is there a in depth UE manual?
The licence of the newsreader I'm currently using (and liking) expires in 14 days.
The demo version of UE expires at the same time.
So I have to know a fair bit about UE by that time.
I'm especially interested in filters. The syntax is quite simple

but I don't even have the slightest clue how to apply them
