still cannot do was PREVIEW does

try to add a box and to fill with white (useful if you want to hide some part of a pdf), one thing that Preview easily does. Not possible.
And the interface is not streamlined and sometimes not mac-like. You struggles and loose time to find things.
Could be very useful an app with mac-like interface with with you could edit pdf.
Do it better and would immidiately buy the premium version

Bob-7-7 about PDF Reader: Viewer Edit Sign