Move clips to new bin = all clips say media offline

Hi all,
# 1 My Studio 20 timeline works fine
# 2 I want to reorganise / tidy my Media Pool so I create a new bin and move my clips to the new bin.
#3 In the Media pool the clips still look fine (I have not changed the path on my hard drive) but in the timeline all the clips say "Media Offline"
Is this expected behaviour and can I fix it?
# 1 My Studio 20 timeline works fine
# 2 I want to reorganise / tidy my Media Pool so I create a new bin and move my clips to the new bin.
#3 In the Media pool the clips still look fine (I have not changed the path on my hard drive) but in the timeline all the clips say "Media Offline"
Is this expected behaviour and can I fix it?