Waving flag simple question

Hi
I am trying to use clothing sim to create a simple waving flag, but am having an annoying issue where my cloth disappears when I try to paint the weights on it… See images below

– I import my asset as skeletal. I then “create clothing data from selection”
– I Apply the clothing data
– I select my clothing data and press activate cloth paint ready to paint my weights.
– My Cloth disappears!

Has anyone else seen this? Thanks