Andy Somerfield

Hi, I had just purchased the Affinity Photo from Apple Store and viewed the tutorial video about how to edit the photos by ways of frequency separation.  With reason unknown, whenever I attempted to do some healing or cloning actions on the low frequency layer, no effect could be seen after I click and drag on the selected area.  As well as the inpainting brush, the selected area would not turn red as it performed on the high frequency layer.    Grateful if you could enlighten me how to manage that kind of skills or pointing out what had I done wrong, many thanks