Adding extra footage to fusion page doesn't work

Hi guys. I done some research but I still can't find the solution. So the problem is that if I want to add some footage photo, material, movie to existing composition I go to media pool tab and drag it like is shown in the Blackmagic introduction video is called What's New in DaVinci Resolve 15
watch from 1:50.
However it always appear as black footage. The only solution is to go back to edit page stuck on top of the footage (photo, movie graphic etc) and than use New Fusion Clip. If you do that you start from scratch. Is that a bug or I'm doing something wrong?
Thanks

Probably a bug. What’s your platform and which kind of footage is that?