Beekay

I found that you must save the .cube file locally (If it’s stored on the internet e.g. Google Drive, Dropbox etc.) onto iPad before It can be loaded into AP.

I looked at the referred post and understand it a bit more as well as more experimenting myself. My conclusion is that it doesn't work on all colours, the stronger the colour being changed then the easier it is to change to something else. Also, i started using other types of brushes and adjustment layers so getting more informed.