Trying to replicate the process (link) to blur (bokeh) an image background and use a mask to retain sharpness of foreground. Desktop version seems to work fine. Ipad version mask requires precise tracing of foreground vs the general masking (black) and having image show properly per the desktop version. How can the ipad version behave like desktop version? Using an Ipad Air2. Does Affinity Photo run differently on iPad Pro?